问题
解答题
计算: (1)(-2
(2)-1-(1+0.5)×
(3)(-1)3×(-5)÷[(-3)2+2×(-5)]. |
答案
(1)原式=(-2
-1 3
)+(-1 2
+15 6
)1 6
=-2
+5 6 1 3
=-2
;1 2
(2)原式=-1-
×3 2
×(-1 3
)1 4
=-1+1 8
=-
;7 8
(3)原式=-1×(-5)÷(9-10)
=-1×(-5)÷(-1)
=-5.