電子課本網(wǎng) › 第44頁

第44頁

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$解：?原式=-5+(-12)-(-12)?$

$ ?\ \ \ \ \ \ \ \ =-5-12+12?$

$ ?\ \ \ \ \ \ \ \ =-5?$

$? ?$

$解:?原式= -9×2×(-2)÷36?$

$ ?\ \ \ \ \ \ \ =36÷36?$

$ ?\ \ \ \ \ \ \ =1?$

$? ?$

$?解：原式=\ \frac{11}5×(-\frac{2}{7})×\frac{7}{11}?$

$ ?\ \ \ \ \ \ \ \ =\ -\frac{2}{5}?$

$?解：原式=\ (-\frac{1}{9})÷\frac{1}{36}?$

$ ?\ \ \ \ \ \ \ \ =\ (-\frac{1}{9})×36?$

$ ?\ \ \ \ \ \ \ \ =-4?$

$?解：原式=\ (-8)×8-8×\frac{1}{8}+8×8?$

$ ?\ \ \ \ \ \ \ \ \ =(-64)-1+64?$

$ ?\ \ \ \ \ \ \ \ =-1?$

$?解：原式=\ -\frac{2}{5}+\frac{5}{8}×(-2.4)-\frac{1}{6}×(-2.4)+\frac{7}{12}×(-2.4)?$

$ ?\ \ \ \ \ \ \ \ =\ -0.4+(-1.5)-(-0.4)+(-1.4)?$

$ ?\ \ \ \ \ \ \ \ =-0.4-1.5+0.4-1.4?$

$ ?\ \ \ \ \ \ \ \ =-2.9?$

$?解: [(-28)-(-4)]÷4=-6(°C)?$

$?冷庫的溫度平均每小時(shí)下降6°C?$

$? ?$

$?解：(1) (2n+1)2-(2n-1)2=8n ?$

$?(2)將n=50代入,得1012-992=400?$

$? ?$

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