问题
解答题
计算: (1)-7+8+(-3) (2)-23×(-
(3)(-18)÷2
(4)
|
答案
(1)-原式=-7+8-3
=-2;
(2)原式=-8×
-491 4
=-2-49
=-51;
(3)原式=(-18)×
×4 9
×(-4 9
)1 16
=(-8)×
×(-4 9
)1 16
=(-
)×(-32 9
)1 16
=
;2 9
(4)原式=2-2-
+1 3 1 3
=0.