题目内容

计算
(1)(+12)+(-7)-(+15)
(2)(
7
9
-
5
6
+
3
4
)×(-36)

(3)(-81)÷
9
4
×
4
9
÷(-
1
36
)

(4)-14-
1
6
×[3-(-3)2]×(-2)
(1)原式=12-7-15
=5-15
=-10;

(2)原式=
7
9
×(-36)-
5
6
×(-36)+
3
4
×(-36)
=-28+30-27
=-25;

(3)原式=(-81)×
4
9
×
4
9
×(-36)
=(-36)×
4
9
×(-36)
=(-16)×(-36)
=576;

(4)原式=-14-
1
6
×[3-9]×(-2)
=-14-
1
6
×(-6)×(-2)
=-1+1×(-2)
=-1-2
=-3.
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