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9.2E:练习

  • Page ID
    204332
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    练习成就完美

    使用产品属性简化平方根

    在以下练习中,进行简化。

    示例\(\PageIndex{52}\)

    \(\sqrt{27}\)

    回答

    \(3\sqrt{3}\)

    示例\(\PageIndex{53}\)

    \(\sqrt{80}\)

    示例\(\PageIndex{54}\)

    \(\sqrt{125}\)

    回答

    \(5\sqrt{5}\)

    示例\(\PageIndex{55}\)

    \(\sqrt{96}\)

    示例\(\PageIndex{56}\)

    \(\sqrt{200}\)

    回答

    \(10\sqrt{2}\)

    示例\(\PageIndex{57}\)

    \(\sqrt{147}\)

    示例\(\PageIndex{58}\)

    \(\sqrt{450}\)

    回答

    \(15\sqrt{2}\)

    示例\(\PageIndex{59}\)

    \(\sqrt{252}\)

    示例\(\PageIndex{60}\)

    \(\sqrt{800}\)

    回答

    \(20\sqrt{2}\)

    示例\(\PageIndex{61}\)

    \(\sqrt{288}\)

    示例\(\PageIndex{62}\)

    \(\sqrt{675}\)

    回答

    \(15\sqrt{3}\)

    示例\(\PageIndex{63}\)

    \(\sqrt{1250}\)

    示例\(\PageIndex{64}\)

    \(\sqrt{x^7}\)

    回答

    \(x^3\sqrt{x}\)

    示例\(\PageIndex{65}\)

    \(\sqrt{y^{11}}\)

    示例\(\PageIndex{66}\)

    \(\sqrt{p^3}\)

    回答

    \(p\sqrt{p}\)

    示例\(\PageIndex{67}\)

    \(\sqrt{q^5}\)

    示例\(\PageIndex{68}\)

    \(\sqrt{m^{13}}\)

    回答

    \(m^6\sqrt{m}\)

    示例\(\PageIndex{69}\)

    \(\sqrt{n^{21}}\)

    示例\(\PageIndex{70}\)

    \(\sqrt{r^{25}}\)

    回答

    \(r^{12}\sqrt{r}\)

    示例\(\PageIndex{71}\)

    \(\sqrt{s^{33}}\)

    示例\(\PageIndex{72}\)

    \(\sqrt{49n^{17}}\)

    回答

    \(7n^8\sqrt{n}\)

    示例\(\PageIndex{73}\)

    \(\sqrt{25m^9}\)

    示例\(\PageIndex{74}\)

    \(\sqrt{81r^{15}}\)

    回答

    \(9r^7\sqrt{r}\)

    示例\(\PageIndex{75}\)

    \(\sqrt{100s^{19}}\)

    示例\(\PageIndex{76}\)

    \(\sqrt{98m^5}\)

    回答

    \(7m^2\sqrt{2m}\)

    示例\(\PageIndex{77}\)

    \(\sqrt{32n^{11}}\)

    示例\(\PageIndex{78}\)

    \(\sqrt{125r^{13}}\)

    回答

    \(5r^6\sqrt{5r}\)

    示例\(\PageIndex{79}\)

    \(\sqrt{80s^{15}}\)

    示例\(\PageIndex{80}\)

    \(\sqrt{200p^{13}}\)

    回答

    \(10p^6\sqrt{2p}\)

    示例\(\PageIndex{81}\)

    \(\sqrt{128q^3}\)

    示例\(\PageIndex{82}\)

    \(\sqrt{242m^{23}}\)

    回答

    \(11m^{11}\sqrt{2m}\)

    示例\(\PageIndex{83}\)

    \(\sqrt{175n^{13}}\)

    练习\(\PageIndex{84}\)

    \(\sqrt{147m^7n^{11}}\)

    回答

    \(7m^3n^5\sqrt{3mn}\)

    示例\(\PageIndex{85}\)

    \(\sqrt{48m^7n^5}\)

    示例\(\PageIndex{86}\)

    \(\sqrt{75r^{13}s^{9}}\)

    回答

    \(5r^{6}s^{4}\sqrt{3rs}\)

    示例\(\PageIndex{87}\)

    \(\sqrt{96r^3s^3}\)

    示例\(\PageIndex{88}\)

    \(\sqrt{300p^9q^{11}}\)

    回答

    \(10p^4q^5\sqrt{3pq}\)

    示例\(\PageIndex{89}\)

    \(\sqrt{192q^3r^7}\)

    示例\(\PageIndex{90}\)

    \(\sqrt{242m^{13}n^{21}}\)

    回答

    \(11m^6n^{10}\sqrt{2mn}\)

    示例\(\PageIndex{91}\)

    \(\sqrt{150m^9n^3}\)

    示例\(\PageIndex{92}\)

    \(5+\sqrt{12}\)

    回答

    \(5+2\sqrt{3}\)

    示例\(\PageIndex{93}\)

    \(8+\sqrt{96}\)

    示例\(\PageIndex{94}\)

    \(1+\sqrt{45}\)

    回答

    \(1+3\sqrt{5}\)

    示例\(\PageIndex{95}\)

    \(3+\sqrt{125}\)

    示例\(\PageIndex{96}\)

    \(\frac{10−\sqrt{24}}{2}\)

    回答

    \(5−\sqrt{6}\)

    示例\(\PageIndex{97}\)

    \(\frac{8−\sqrt{80}}{4}\)

    示例\(\PageIndex{98}\)

    \(\frac{3+\sqrt{90}}{3}\)

    回答

    \(1+\sqrt{10}\)

    示例\(\PageIndex{99}\)

    \(\frac{15+\sqrt{75}}{5}\)

    使用 Quotient 属性简化平方根

    在以下练习中,进行简化。

    示例\(\PageIndex{100}\)

    \(\sqrt{\frac{49}{64}}\)

    回答

    \(\frac{7}{8}\)

    示例\(\PageIndex{101}\)

    \(\sqrt{\frac{100}{36}}\)

    示例\(\PageIndex{102}\)

    \(\sqrt{\frac{121}{16}}\)

    回答

    \(\frac{11}{4}\)

    示例\(\PageIndex{103}\)

    \(\sqrt{\frac{144}{169}}\)

    示例\(\PageIndex{104}\)

    \(\sqrt{\frac{72}{98}}\)

    回答

    \(\frac{6}{7}\)

    示例\(\PageIndex{105}\)

    \(\sqrt{\frac{75}{12}}\)

    示例\(\PageIndex{106}\)

    \(\sqrt{\frac{45}{125}}\)

    回答

    \(\frac{3}{5}\)

    示例\(\PageIndex{107}\)

    \(\sqrt{\frac{300}{243}}\)

    示例\(\PageIndex{108}\)

    \(\sqrt{\frac{x^{10}}{x^6}}\)

    回答

    \(x^2\)

    示例\(\PageIndex{109}\)

    \(\sqrt{\frac{p^{20}}{p^{10}}}\)

    示例\(\PageIndex{110}\)

    \(\sqrt{\frac{y^4}{y^8}}\)

    回答

    \(\frac{1}{y^2}\)

    示例\(\PageIndex{111}\)

    \(\sqrt{\frac{q^8}{q^{14}}}\)

    示例\(\PageIndex{112}\)

    \(\sqrt{\frac{200x^7}{2x^3}}\)

    回答

    \(10x^2\)

    示例\(\PageIndex{113}\)

    \(\sqrt{\frac{98y^{11}}{2y^5}}\)

    示例\(\PageIndex{114}\)

    \(\sqrt{\frac{96p^9}{6p}}\)

    回答

    \(4p^4\)

    示例\(\PageIndex{115}\)

    \(\sqrt{\frac{108q^{10}}{3q^2}}\)

    示例\(\PageIndex{116}\)

    \(\sqrt{\frac{36}{35}}\)

    回答

    \(\frac{6}{\sqrt{35}}\)

    示例\(\PageIndex{117}\)

    \(\sqrt{\frac{144}{65}}\)

    示例\(\PageIndex{118}\)

    \(\sqrt{\frac{20}{81}}\)

    回答

    \(\frac{2\sqrt{5}}{9}\)

    示例\(\PageIndex{119}\)

    \(\sqrt{\frac{211}{96}}\)

    示例\(\PageIndex{120}\)

    \(\sqrt{\frac{96x^7}{121}}\)

    回答

    \(\frac{4x^3\sqrt{6x}}{11}\)

    示例\(\PageIndex{121}\)

    \(\sqrt{\frac{108y^4}{49}}\)

    示例\(\PageIndex{122}\)

    \(\sqrt{\frac{300m^5}{64}}\)

    回答

    \(\frac{5m^2\sqrt{3m}}{4}\)

    示例\(\PageIndex{123}\)

    \(\sqrt{\frac{125n^7}{169}}\)

    示例\(\PageIndex{124}\)

    \(\sqrt{\frac{98r^5}{100}}\)

    回答

    \(\frac{7r^2\sqrt{2r}}{10}\)

    示例\(\PageIndex{125}\)

    \(\sqrt{\frac{180s^{10}}{144}}\)

    示例\(\PageIndex{126}\)

    \(\sqrt{\frac{28q^6}{225}}\)

    回答

    \(\frac{2q^3\sqrt{7}}{15}\)

    示例\(\PageIndex{127}\)

    \(\sqrt{\frac{150r^3}{256}}\)

    示例\(\PageIndex{128}\)

    \(\sqrt{\frac{75r^9}{s^8}}\)

    回答

    \(\frac{5r^4\sqrt{3r}}{s^4}\)

    示例\(\PageIndex{129}\)

    \(\sqrt{\frac{72x^5}{y^6}}\)

    示例\(\PageIndex{130}\)

    \(\sqrt{\frac{28p^7}{q^2}}\)

    回答

    \(\frac{4p^3\sqrt{7p}}{q}\)

    示例\(\PageIndex{131}\)

    \(\sqrt{\frac{45r^3}{s^{10}}}\)

    示例\(\PageIndex{132}\)

    \(\sqrt{\frac{100x^5}{36x^3}}\)

    回答

    \(\frac{5x}{3}\)

    示例\(\PageIndex{133}\)

    \(\sqrt{\frac{49r^{12}}{16r^6}}\)

    示例\(\PageIndex{134}\)

    \(\sqrt{\frac{121p^5}{81p^2}}\)

    回答

    \(\frac{11p\sqrt{p}}{9}\)

    示例\(\PageIndex{135}\)

    \(\sqrt{\frac{25r^8}{64r}}\)

    示例\(\PageIndex{136}\)

    \(\sqrt{\frac{32x^{5}y^{3}}{18x^{3}y}}\)

    回答

    \(\frac{4xy}{3}\)

    示例\(\PageIndex{137}\)

    \(\sqrt{\frac{75r^{6}s^{8}}{48rs^{4}}}\)

    示例\(\PageIndex{138}\)

    \(\sqrt{\frac{27p^{2}q^{10}}{8p^5q^3}}\)

    回答

    \(\frac{1}{2pq\sqrt{p}}\)

    示例\(\PageIndex{139}\)

    \(\sqrt{\frac{50r^5s^2}{128r^2s^5}}\)

    日常数学

    示例\(\PageIndex{140}\)
    1. 埃利奥特决定建造一个方形花园,占地288平方英尺的院子。 简化\(\sqrt{288}\)以确定他花园的长度和宽度。 四舍五入到最接近的十分之一英尺。
    2. 假设埃利奥特决定缩小方形花园的面积,这样他就可以在花园的北侧和东侧创建一条5英尺宽的步行道。 简化\(\sqrt{288}−5\)以确定新花园的长度和宽度。 四舍五入到最接近的十分之一英尺。
    回答
    1. 17.0 英尺
    2. 15.0 英尺
    示例\(\PageIndex{141}\)
    1. 梅利莎不小心从离地面 64 英尺的过山车顶部掉了一副太阳镜。 简化\(\sqrt{\frac{64}{16}}\)以确定太阳镜到达地面所需的秒数。
    2. 假设前一个示例中的太阳镜是从 144 英尺的高度掉下来的。 简化\(\sqrt{\frac{144}{16}}\)以确定太阳镜到达地面所需的秒数。

    写作练习

    示例\(\PageIndex{142}\)

    解释原因\(\sqrt{x^4}=x^2\)。 然后解释原因\(\sqrt{x^{16}}=x^8\)

    回答

    答案会有所不同。

    示例\(\PageIndex{143}\)

    解释\(7+\sqrt{9}\)为什么不等于\(\sqrt{7+9}\)

    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。

    此表有四列和三行。 这些列标有 “我可以...”、“自信地”、“有帮助” 和 “不,我不明白!” “我可以...” 下的行读取 “使用产品属性简化平方根。” 和 “使用商属性简化平方根”。 其他列下的其他行为空。

    ⓑ 看完这份清单后,你会怎么做才能对所有目标充满信心?