题目内容

计算题:
(1)2-5+4-(-7)+(-6)
(2)(-1
1
3
)÷0.8×(-
6
7

(3)(2
1
4
-4
1
2
-1
1
8
)×(-
8
9

(4)-22×(-
1
2
)+8÷(-2)2

(5)-12+|-8|÷(3-5)-(-2)3
(1)原式=2-5+4+7-6
=-3+4+7-6
=1+7-6
=2;

(2)原式=(-
5
3
)÷
4
5
×(-
6
7

=(-
5
3
)×
5
4
×(-
6
7

=(-
25
12
)×(-
6
7

=
25
14


(3)原式=(
9
4
-
9
2
-
9
8
)×(-
8
9

=
9
4
×(-
8
9
)-
9
2
×(-
8
9
)-
9
8
×(-
8
9

=-2+4+1
=3;

(4)原式=-4×(-
1
2
)+8×
1
4

=2+2
=4;

(5)原式=-1+8÷(-2)+8
=-1-4+8
=5.
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