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用简便方法计算9.87-(9.87加2.5)

9.87-(9.87+2.5) =9.87-9.87-2.5 =-2.5

如下

=87x(9-6-1) =87x2 =174

abs函数是求绝对值的,但只对整型数求绝对值。这题会有错误提示吧。改为fabs(-9.87)既可以了。

9.87—(3.87—2.9) =9.87-3.87+2.9 =6+2.9 =8.9

87×9+87×2 =87×(9+2) =87×11 =957 你好,本题已解答,如果满意,请点右上角“采纳答案”,支持一下。

37.8+4.56-9.87 =37.8+4.56-10+0.13 =(37.8-10)+(4.56+0.13) =27.8+4.69 =27.8+2.2+2.49 =30+2.49 =32.49

101x9.87-9.87 =(101-1)×9.87 =100×9.87 =987

87×9+87×2-87 =87×(9+2-1) =87×10 =870

0.25×9.87×4 =0.25×4×9.87 =1×9.87 =9.87

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