问题 解答题
计算:
(1)(+45)+(-91)+5;
(2)(-20)-(+5)-(-5);
(3)(-2)3×32-(-4)×2;
(4)(-1)÷(-5)×
1
5
答案

(1)原式=45-91+5

=-46+5

=-41;

(2)原式=-20-5+5

=-25+5

=-20;

(3)原式=-8×9-(-8)

=-72+8

=-64;

(4)原式=(-1)×(-

1
5
)×
1
5
=
1
25

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