问题
解答题
计算: (1)12-(-18)+(-7)-15 (2)(-
(3)125
(4)-16-(-1-0.5)×
|
答案
(1)12+18-7-15
=30-22
=8;
(2)原式=
×4 9
×(-3)9 8
=-
;3 2
(3)原式=(125+
)×(-5 7
)1 5
=-25
;1 7
(4)原式=-1-(-
)×3 2
÷41 3
=-1+1 8
=-
.7 8
计算: (1)12-(-18)+(-7)-15 (2)(-
(3)125
(4)-16-(-1-0.5)×
|
(1)12+18-7-15
=30-22
=8;
(2)原式=
×4 9
×(-3)9 8
=-
;3 2
(3)原式=(125+
)×(-5 7
)1 5
=-25
;1 7
(4)原式=-1-(-
)×3 2
÷41 3
=-1+1 8
=-
.7 8