Skip to main content
Global

1.6E:练习

  • Page ID
    205070
  • \( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}} } \)

    \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash {#1}}} \)

    \( \newcommand{\dsum}{\displaystyle\sum\limits} \)

    \( \newcommand{\dint}{\displaystyle\int\limits} \)

    \( \newcommand{\dlim}{\displaystyle\lim\limits} \)

    \( \newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\)

    ( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\)

    \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\)

    \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\)

    \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\)

    \( \newcommand{\Span}{\mathrm{span}}\)

    \( \newcommand{\id}{\mathrm{id}}\)

    \( \newcommand{\Span}{\mathrm{span}}\)

    \( \newcommand{\kernel}{\mathrm{null}\,}\)

    \( \newcommand{\range}{\mathrm{range}\,}\)

    \( \newcommand{\RealPart}{\mathrm{Re}}\)

    \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\)

    \( \newcommand{\Argument}{\mathrm{Arg}}\)

    \( \newcommand{\norm}[1]{\| #1 \|}\)

    \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\)

    \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\AA}{\unicode[.8,0]{x212B}}\)

    \( \newcommand{\vectorA}[1]{\vec{#1}}      % arrow\)

    \( \newcommand{\vectorAt}[1]{\vec{\text{#1}}}      % arrow\)

    \( \newcommand{\vectorB}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}} } \)

    \( \newcommand{\vectorC}[1]{\textbf{#1}} \)

    \( \newcommand{\vectorD}[1]{\overrightarrow{#1}} \)

    \( \newcommand{\vectorDt}[1]{\overrightarrow{\text{#1}}} \)

    \( \newcommand{\vectE}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash{\mathbf {#1}}}} \)

    \( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}} } \)

    \(\newcommand{\longvect}{\overrightarrow}\)

    \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash {#1}}} \)

    \(\newcommand{\avec}{\mathbf a}\) \(\newcommand{\bvec}{\mathbf b}\) \(\newcommand{\cvec}{\mathbf c}\) \(\newcommand{\dvec}{\mathbf d}\) \(\newcommand{\dtil}{\widetilde{\mathbf d}}\) \(\newcommand{\evec}{\mathbf e}\) \(\newcommand{\fvec}{\mathbf f}\) \(\newcommand{\nvec}{\mathbf n}\) \(\newcommand{\pvec}{\mathbf p}\) \(\newcommand{\qvec}{\mathbf q}\) \(\newcommand{\svec}{\mathbf s}\) \(\newcommand{\tvec}{\mathbf t}\) \(\newcommand{\uvec}{\mathbf u}\) \(\newcommand{\vvec}{\mathbf v}\) \(\newcommand{\wvec}{\mathbf w}\) \(\newcommand{\xvec}{\mathbf x}\) \(\newcommand{\yvec}{\mathbf y}\) \(\newcommand{\zvec}{\mathbf z}\) \(\newcommand{\rvec}{\mathbf r}\) \(\newcommand{\mvec}{\mathbf m}\) \(\newcommand{\zerovec}{\mathbf 0}\) \(\newcommand{\onevec}{\mathbf 1}\) \(\newcommand{\real}{\mathbb R}\) \(\newcommand{\twovec}[2]{\left[\begin{array}{r}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\ctwovec}[2]{\left[\begin{array}{c}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\threevec}[3]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\cthreevec}[3]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\fourvec}[4]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\cfourvec}[4]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\fivevec}[5]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\cfivevec}[5]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\mattwo}[4]{\left[\begin{array}{rr}#1 \amp #2 \\ #3 \amp #4 \\ \end{array}\right]}\) \(\newcommand{\laspan}[1]{\text{Span}\{#1\}}\) \(\newcommand{\bcal}{\cal B}\) \(\newcommand{\ccal}{\cal C}\) \(\newcommand{\scal}{\cal S}\) \(\newcommand{\wcal}{\cal W}\) \(\newcommand{\ecal}{\cal E}\) \(\newcommand{\coords}[2]{\left\{#1\right\}_{#2}}\) \(\newcommand{\gray}[1]{\color{gray}{#1}}\) \(\newcommand{\lgray}[1]{\color{lightgray}{#1}}\) \(\newcommand{\rank}{\operatorname{rank}}\) \(\newcommand{\row}{\text{Row}}\) \(\newcommand{\col}{\text{Col}}\) \(\renewcommand{\row}{\text{Row}}\) \(\newcommand{\nul}{\text{Nul}}\) \(\newcommand{\var}{\text{Var}}\) \(\newcommand{\corr}{\text{corr}}\) \(\newcommand{\len}[1]{\left|#1\right|}\) \(\newcommand{\bbar}{\overline{\bvec}}\) \(\newcommand{\bhat}{\widehat{\bvec}}\) \(\newcommand{\bperp}{\bvec^\perp}\) \(\newcommand{\xhat}{\widehat{\xvec}}\) \(\newcommand{\vhat}{\widehat{\vvec}}\) \(\newcommand{\uhat}{\widehat{\uvec}}\) \(\newcommand{\what}{\widehat{\wvec}}\) \(\newcommand{\Sighat}{\widehat{\Sigma}}\) \(\newcommand{\lt}{<}\) \(\newcommand{\gt}{>}\) \(\newcommand{\amp}{&}\) \(\definecolor{fillinmathshade}{gray}{0.9}\)

    练习成就完美

    查找等效分数

    在以下练习中,找到等同于给定分数的三个分数。 用数字或代数展示你的作品。

    练习\(\PageIndex{1}\)

    \(\dfrac{3}{8}\)

    回答

    \(\dfrac{6}{16}\),,\(\dfrac{9}{24}\)\(\dfrac{12}{32}\), 答案可能有所不同

    练习\(\PageIndex{2}\)

    \(\dfrac{5}{8}\)

    练习\(\PageIndex{3}\)

    \(\dfrac{5}{9}\)

    回答

    \(\dfrac{10}{18}\),,\(\dfrac{15}{27}\)\(\dfrac{20}{36}\), 答案可能有所不同

    练习\(\PageIndex{4}\)

    \(\dfrac{1}{8}\)

    简化分数

    在以下练习中,进行简化。

    练习\(\PageIndex{5}\)

    \(-\dfrac{40}{88}\)

    回答

    \(-\dfrac{5}{11}\)

    练习\(\PageIndex{6}\)

    \(-\dfrac{63}{99}\)

    练习\(\PageIndex{7}\)

    \(-\dfrac{108}{63}\)

    回答

    \(-\dfrac{12}{7}\)

    练习\(\PageIndex{8}\)

    \(-\dfrac{104}{48}\)

    练习\(\PageIndex{9}\)

    \(\dfrac{120}{252}\)

    回答

    \(\dfrac{10}{21}\)

    练习\(\PageIndex{10}\)

    \(\dfrac{182}{294}\)

    练习\(\PageIndex{11}\)

    \(-\dfrac{3x}{12y}\)

    回答

    \(-\dfrac{x}{4y}\)

    练习\(\PageIndex{12}\)

    \(-\dfrac{4x}{32y}\)

    练习\(\PageIndex{13}\)

    \(\dfrac{14x^{2}}{21y}\)

    回答

    \(\dfrac{2x^{2}}{3y}\)

    练习\(\PageIndex{14}\)

    \(\dfrac{24a}{32b^{2}}\)

    乘以分数

    在以下练习中,乘以。

    练习\(\PageIndex{15}\)

    \(\dfrac{3}{4}\cdot \dfrac{9}{10}\)

    回答

    \(\dfrac{27}{40}\)

    练习\(\PageIndex{16}\)

    \(\dfrac{4}{5}\cdot \dfrac{2}{7}\)

    练习\(\PageIndex{17}\)

    \(-\dfrac{2}{3}\cdot -\dfrac{3}{8}\)

    回答

    \(\dfrac{1}{4}\)

    练习\(\PageIndex{18}\)

    \(-\dfrac{3}{4}\left(-\dfrac{4}{9}\right)\)

    练习\(\PageIndex{19}\)

    \(-\dfrac{5}{9}\cdot \dfrac{3}{10}\)

    回答

    \(-\dfrac{1}{6}\)

    练习\(\PageIndex{20}\)

    \(-\dfrac{3}{8}\cdot \dfrac{4}{15}\)

    练习\(\PageIndex{21}\)

    \(\left(-\dfrac{14}{15}\right)\left(\dfrac{9}{20}\right)\)

    回答

    \(-\dfrac{21}{50}\)

    练习\(\PageIndex{22}\)

    \(\left(-\dfrac{9}{10}\right)\left(\dfrac{25}{33}\right)\)

    练习\(\PageIndex{23}\)

    \(\left(-\dfrac{63}{84}\right)\left(-\dfrac{44}{90}\right)\)

    回答

    \(\dfrac{11}{30}\)

    练习\(\PageIndex{24}\)

    \(\left(-\dfrac{63}{60}\right)\left(-\dfrac{40}{88}\right)\)

    练习\(\PageIndex{25}\)

    \(4\cdot \dfrac{5}{11}\)

    回答

    \(\dfrac{20}{11}\)

    练习\(\PageIndex{26}\)

    \(5\cdot \dfrac{8}{3}\)

    练习\(\PageIndex{27}\)

    \(\dfrac{3}{7}\cdot 21n\)

    回答

    9n

    练习\(\PageIndex{28}\)

    \(\dfrac{5}{6}\cdot 30m\)

    练习\(\PageIndex{29}\)

    \(-8\cdot\dfrac{17}{4}\)

    回答

    −34

    练习\(\PageIndex{30}\)

    \((-1)\left(-\dfrac{6}{7}\right)\)

    除以分数

    在以下练习中,除以。

    练习\(\PageIndex{31}\)

    \(\dfrac{3}{4}\div \dfrac{2}{3}\)

    回答

    \(\dfrac{9}{8}\)

    练习\(\PageIndex{32}\)

    \(\dfrac{4}{5}\div \dfrac{3}{4}\)

    练习\(\PageIndex{33}\)

    \(-\dfrac{7}{9}\div \left(-\dfrac{7}{4}\right)\)

    回答

    1

    练习\(\PageIndex{34}\)

    \(-\dfrac{5}{6}\div \left(-\dfrac{5}{6}\right)\)

    练习\(\PageIndex{35}\)

    \(\dfrac{3}{4}\div \dfrac{x}{11}\)

    回答

    \(\dfrac{33}{4x}\)

    练习\(\PageIndex{36}\)

    \(\dfrac{2}{5}\div \dfrac{y}{9}\)

    练习\(\PageIndex{37}\)

    \(\dfrac{5}{18}\div -\dfrac{15}{24}\)

    回答

    \(-\dfrac{4}{9}\)

    练习\(\PageIndex{38}\)

    \(\dfrac{7}{18}\div \left(-\dfrac{14}{27}\right)\)

    练习\(\PageIndex{39}\)

    \(\dfrac{8u}{15} \div \dfrac{12v}{25}\)

    回答

    \(\dfrac{10u}{9v}\)

    练习\(\PageIndex{40}\)

    \(\dfrac{12r}{25}\div \dfrac{18s}{35}\)

    练习\(\PageIndex{41}\)

    \(-5\div \dfrac{1}{2}\)

    回答

    -10

    练习\(\PageIndex{42}\)

    \(-3\div \dfrac{1}{4}\)

    练习\(\PageIndex{43}\)

    \(\dfrac{3}{4}\div (-12)\)

    回答

    \(\dfrac{1}{16}\)

    练习\(\PageIndex{44}\)

    \(-15\div -\dfrac{5}{3}\)

    在以下练习中,进行简化。

    练习\(\PageIndex{45}\)

    \(\dfrac{-\dfrac{8}{21}}{\dfrac{12}{35}}\)

    回答

    \(-\dfrac{10}{9}\)

    练习\(\PageIndex{46}\)

    \(\dfrac{-\dfrac{9}{16}}{\dfrac{33}{40}}\)

    练习\(\PageIndex{47}\)

    \(\dfrac{-\dfrac{4}{5}}{2}\)

    回答

    \(-\dfrac{2}{5}\)

    练习\(\PageIndex{48}\)

    \(\dfrac{5}{\dfrac{3}{10}}\)

    练习\(\PageIndex{49}\)

    \(\dfrac{\dfrac{m}{3}}{\dfrac{n}{2}}\)

    回答

    \(\dfrac{2m}{3n}\)

    练习\(\PageIndex{50}\)

    \(\dfrac{-\dfrac{3}{8}}{-\dfrac{y}{12}}\)

    简化使用分数条编写的表达式

    在以下练习中,进行简化。

    练习\(\PageIndex{51}\)

    \(\dfrac{22 + 3}{10}\)

    回答

    \(\dfrac{5}{2}\)

    练习\(\PageIndex{52}\)

    \(\dfrac{19 - 4}{6}\)

    练习\(\PageIndex{53}\)

    \(\dfrac{48}{24 - 15}\)

    回答

    \(\dfrac{16}{3}\)

    练习\(\PageIndex{54}\)

    \(\dfrac{46}{4 + 4}\)

    练习\(\PageIndex{55}\)

    \(\dfrac{-6 + 6}{8 + 4}\)

    回答

    0

    练习\(\PageIndex{56}\)

    \(\dfrac{-6 + 3}{17 - 8}\)

    练习\(\PageIndex{57}\)

    \(\dfrac{4\cdot 3}{6\cdot 6}\)

    回答

    \(\dfrac{1}{3}\)

    练习\(\PageIndex{58}\)

    \(\dfrac{6\cdot 6}{9\cdot 2}\)

    练习\(\PageIndex{59}\)

    \(\dfrac{4^{2} - 1}{25}\)

    回答

    \(\dfrac{3}{5}\)

    练习\(\PageIndex{60}\)

    \(\dfrac{7^{2} + 1}{60}\)

    练习\(\PageIndex{61}\)

    \(\dfrac{8\cdot 3 + 2\cdot 9}{14 + 3}\)

    回答

    \(2\dfrac{8}{17}\)

    练习\(\PageIndex{62}\)

    \(\dfrac{9\cdot 6 - 4\cdot 7}{22 + 3}\)

    练习\(\PageIndex{63}\)

    \(\dfrac{5\cdot 6 - 3\cdot 4}{4\cdot 5 -2\cdot 3}\)

    回答

    \(\dfrac{9}{7}\)

    练习\(\PageIndex{64}\)

    \(\dfrac{8\cdot 9 - 7\cdot 6}{5\cdot 6 - 9\cdot 2}\)

    练习\(\PageIndex{65}\)

    \(\dfrac{5^{2} - 3^{2}}{3 - 5}\)

    回答

    \(-8\)

    练习\(\PageIndex{66}\)

    \(\dfrac{6^{2} - 4^{2}}{4 - 6}\)

    练习\(\PageIndex{67}\)

    \(\dfrac{7\cdot 4 - 2(8 - 5)}{9\cdot 3 - 3\cdot 5}\)

    回答

    \(\dfrac{11}{6}\)

    练习\(\PageIndex{68}\)

    \(\dfrac{9\cdot 7 - 3(12- 8)}{8\cdot 7- 6\cdot 6}\)

    练习\(\PageIndex{69}\)

    \(\dfrac{9(8-2)-3(15-7)}{6(7-1) - 3(17-9)}\)

    回答

    \(\dfrac{5}{2}\)

    练习\(\PageIndex{70}\)

    \(\dfrac{8(9-2) - 4(14 - 9)}{7(8-3)-3(16 -9)}\)

    将短语翻译成带分数的表达式

    在以下练习中,将每个英语短语翻译成代数表达式。

    练习\(\PageIndex{71}\)

    \(r\)和的商和之\(s\)\(10\)

    回答

    \(\dfrac{r}{s + 10}\)

    练习\(\PageIndex{72}\)

    \(A\)和 and 的商\(3\)和差\(B\)

    练习\(\PageIndex{73}\)

    and 之差的商\(y\)\(x\)以及\(−3\)

    回答

    \(\dfrac{x - y}{-3}\)

    练习\(\PageIndex{74}\)

    and 之\(m\)和的商\(n\),以及\(4q\)

    日常数学

    练习\(\PageIndex{75}\)

    烘烤。 巧克力曲奇的食谱需要一\(\frac{3}{4}\)杯红糖。 伊梅尔达想把食谱加倍。

    1. 伊梅尔达需要多少红糖? 显示您的计算结果。
    2. 量杯通常以\(\frac{1}{4}\)\(\frac{1}{3}\)\(\frac{1}{2}\)、和\(1\)杯子为一组。 画一张图,展示伊梅尔达可以用两种不同的方法来测量将饼干配方翻倍所需的红糖。
    回答
    1. \(1\frac{1}{2}\)杯子
    2. 答案会有所不同
    练习\(\PageIndex{76}\)

    烘烤。 Nina 正在制作 4 盘软糖,供音乐演奏会结束后食用。 每个平底锅她都需要一\(\frac{2}{3}\)杯炼乳。

    1. 妮娜需要多少炼乳? 显示您的计算结果。
    2. 量杯通常以\(\frac{1}{4}\)\(\frac{1}{3}\)\(\frac{1}{2}\)、和\(1\)杯子为一组。 画一张图,显示 Nina 可以用两种不同的方法来测量一\(4\)锅软糖所需的炼乳。
    练习\(\PageIndex{77}\)

    P@@ ar tions Don 购买了一包重达\(5\)磅的散装糖果。 他想把糖装在装\(\frac{1}{4}\)磅的小袋子里卖掉。 他能从散装包装中装多少小袋糖果?

    回答

    \(20\)袋子

    练习\(\PageIndex{78}\)

    Partions Kristen 有@@ \(\frac{3}{4}\)码的丝带,她想把它们剪成\(6\)相等的部分,为女儿的\(6\)洋娃娃做发带。 每个娃娃的发带会有多长?

    写作练习

    练习\(\PageIndex{79}\)

    拉斐尔想在餐厅点半个中等大小的披萨。 服务员告诉他,中等大小的披萨可以切成\(6\)或切成\(8\)薄片。 他更喜欢\(3\)\(6\)片还是\(4\)切成\(8\)薄片? 拉斐尔回答说,既然他不是很饿,他更喜欢\(3\)切成\(6\)薄片。 解释拉斐尔的推理有什么问题。

    回答

    答案可能有所不同

    练习\(\PageIndex{80}\)

    举一个日常生活中的例子,说明\(\dfrac{1}{2}\cdot \dfrac{2}{3}\)情况如何\(\dfrac{1}{3}\)

    练习\(\PageIndex{81}\)

    解释如何找到分数的倒数。

    回答

    答案可能有所不同

    练习\(\PageIndex{82}\)

    解释如何找到负数的倒数。

    自检

    ⓐ 完成练习后,使用这份清单来评估你对本节目标的掌握程度。

    图中显示了一个由四列七行组成的表。 第一行在第一列中写着 “我能...”,第二列是 “自信”,第三列是 “有帮助”,最后一列是 “不,我不明白”。 第一列的下一行是 “查找等效分数”,下面是 “简化分数”,下面是 “乘以分数”,下面是 “除分数”,下面是 “简化用分数条写的表达式”,下面是 “将短语翻译成表达式”用分数表示。”

    ⓑ 看完清单后,你认为你为下一节做好了充分的准备吗? 为什么或者为什么不呢?


    This page titled 1.6E:练习 is shared under a not declared license and was authored, remixed, and/or curated by OpenStax via source content that was edited to the style and standards of the LibreTexts platform.