问题
解答题
计算: (1)(-20)+(+3)-(-5)-(-7); (2)(-
(3)-22×(-5)-6÷(-2)2×|-
|
答案
(1)原式=-20+3+5+7
=-5;
(2)原式=(-
)×(-36)-3 4
×(-36)+7 9
×(-36)5 12
=27+28-15
=40;
(3)原式=-4×(-5)-6÷4×1 4
=20-
×3 2 1 4
=20-3 8
=19
.5 8