问题
解答题
计算 (1)-20-(+14)+(-18)-(-13) (2)-2
(3)(-81)÷2
(4)(-7)×(-5)-90÷(-15) (5)(-36)×(
(6)-42÷(-
|
答案
(1)原式=-20-14-18+13
=-38-1
=-39;
(2)原式=-2
3 |
4 |
1 |
4 |
1 |
8 |
3 |
8 |
=-5+3
1 |
2 |
=-1
1 |
2 |
(3)原式=-81×
4 |
9 |
1 |
9 |
1 |
4 |
=1;
(4)原式=35+6
=41;
(5)原式=-36×
3 |
4 |
5 |
6 |
7 |
9 |
=-27+30-28
=-25;
(6)原式=-16×(-2)×(-1)+24+
1 |
8 |
1 |
3 |
3 |
4 |
=-32+24+3+24+8-18
=-40+51
=9.