问题
解答题
计算题 (1)23-17-(-7)+(-16) (2)-3÷(-5)×
(3)(
(4)(-1)100-
|
答案
(1)原式=23-17+7+(-16)
=13+(-16)
=-3;
(2)原式=-3×(-
)×1 5 1 5
=
;3 25
(3)原式=
×(-60)-2 3
×(-60)-11 12
×(-60)14 15
=-40+55+56
=61;
(4)原式=1-
×(3-9)1 6
=1-
×(-6)1 6
=1+1
=2.