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
-23 4
+1 4
+31 8 3 8
=-5+31 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×
-36×(-3 4
)-36×5 6 7 9
=-27+30-28
=-25;
(6)原式=-16×(-2)×(-1)+24+
×24+24+1 8
×24-1 3
×243 4
=-32+24+3+24+8-18
=-40+51
=9.