问题
解答题
计算: (1)3
(2)-1
(3)-22×(-
(4)-3-[-5+(1-2×
(5)-2-12×(
|
答案
(1)原式=3
-1 2
+1 2
+21 3 2 3
=3+3
=6;
(2)原式=-(
×9 7
×6 11
×7)11 8
=-
;27 4
(3)原式=4×
+8÷41 2
=2+2
=4;
(4)原式=-3+5-(1-2×
)÷(-2)3 5
=2-(-
)×(-1 5
)1 2
=2-1 10
=
;19 10
(5)原式=-2-(
×12-1 3
×12+1 4
×12)1 2
=-2-(4-3+6)
=-2-7
=-9.