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電子課本網(wǎng) 第159頁

第159頁

信息發(fā)布者:
解:
$\begin{aligned}&\sqrt[3]{-8}-\sqrt{(-1)^2}\\=& -2 - 1\\=& -3\end{aligned}$
解:
$\begin{aligned}&\sqrt{(-5)^2}-\sqrt[3]{8}-\sqrt{\frac{1}{4}}\\=& 5 - 2-\frac{1}{2}\\=& 3-\frac{1}{2}\\=& 2.5\end{aligned}$
解:
$\begin{aligned}&(\sqrt{3})^{-2}-\sqrt[3]{-64}-\sqrt{3^2 + 4^2}\\=&\frac{1}{(\sqrt{3})^2}-(-4)-\sqrt{9 + 16}\\=&\frac{1}{3}+4 - 5\\=&\frac{1}{3}-1\\=&-\frac{2}{3}\end{aligned}$
解:
$\begin{aligned}&|2-\sqrt{5}|-(\sqrt{5}-3)+(\sqrt{5}-1)^0\\=&\sqrt{5}-2-\sqrt{5}+3 + 1\\=&(-2 + 3+1)+(\sqrt{5}-\sqrt{5})\\=&2\end{aligned}$
解:
$\begin{aligned}&2\sqrt{\frac{1}{4}}-|2 - \sqrt{3}|+\sqrt{9^2}+\sqrt[3]{-27}\\=&2\times\frac{1}{2}-(2 - \sqrt{3})+9-3\\=&1-2+\sqrt{3}+9 - 3\\=&(1-2 + 9-3)+\sqrt{3}\\=&5+\sqrt{3}\end{aligned}$
解:
$\begin{aligned}4x^2+1&=10\\4x^2&=10 - 1\\4x^2&=9\\x^2&=\frac{9}{4}\\x&=\pm\frac{3}{2}\end{aligned}$
解:
$\begin{aligned}(x - 1)^2-25&=0\\(x - 1)^2&=25\\x - 1&=\pm5\end{aligned}$
當(dāng)$x - 1 = 5$時,$x = 6;$當(dāng)$x - 1=-5$時,$x=-4。$所以$x = 6$或$x=-4。$
解:
$\begin{aligned}64(x + 1)^3&=-125\\(x + 1)^3&=-\frac{125}{64}\\x + 1&=-\frac{5}{4}\\x&=-\frac{5}{4}-1\\x&=-\frac{9}{4}\end{aligned}$
解:
$\begin{aligned}(2x + 1)^3+0.008&=0\\(2x + 1)^3&=-0.008\\2x + 1&=-0.2\\2x&=-0.2 - 1\\2x&=-1.2\\x&=-0.6\end{aligned}$
解:
$\begin{aligned}3(1 - 3x)^2-27&=0\\3(1 - 3x)^2&=27\\(1 - 3x)^2&=9\\1 - 3x&=\pm3\end{aligned}$
當(dāng)$1 - 3x = 3$時,$-3x=3 - 1,$$-3x = 2,$$x=-\frac{2}{3};$當(dāng)$1 - 3x=-3$時,$-3x=-3 - 1,$$-3x=-4,$$x=\frac{4}{3}。$所以$x =-\frac{2}{3}$或$x=\frac{4}{3}。$