问题
解答题
计算: (1)-20+(-14)-(-18)+13; (2)
(3)(-
(4)-22+(-2)2-|-
|
答案
(1)-20+(-14)-(-18)+13
=-20-14+18+13
=-34+31
=-3;
(2)
÷(-7 4
)-7 8
×(-6)2 3
=-2-(-4)
=2;
(3)(-
-3 4
+7 6
)÷(-11 12
)1 24
=(-
-3 4
+7 6
)×(-24)11 12
=
×24+3 4
×24-7 6
×2411 12
=18+28-22
=24;
(4)-22+(-2)2-|-
|×(-10)21 4
=-4+4-
×1001 4
=-4+4-25
=-25.