问题
解答题
计算: (1)(1
(2)[1-(1-0.5×
(3)
(4)-10+8÷(-2)2-(-4)×(-3). |
答案
(1)原式=(1
-3 4
)×(-7 12
)+(-8 7
)=-2+8 3
-2 3
=-4;8 3
(2)原式=(1-
)×(2-9)=-5 6
;7 6
(3)原式=
×(-11 5
)×1 6
×3 11
=-4 5
;2 25
(4)原式=-10+8÷4-12=-10+2-12=-20.