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