问题 解答题
计算
(1)-4-28-(-29)+(-24);
(2)-
3
4
×(-1
1
2
)÷(-2
1
4
)

(3)-14÷(-5)2×(-
5
3
)+|0.8-1|

(4)[50-(
7
9
-
11
12
+
1
6
)×(-6)2]÷(-7)2

(5)4x-(x-3y);
(6)5(3a2b-ab2)-4(-ab2+3a2b).
答案

(1)原式=-32+29-24,

=-56+29,

=-27;

(2)原式=-

3
4
×(-
3
2
)÷(-
9
4
),

=

3
2
×(-
4
9
),

=-

1
2

(3)原式=-1÷25×(-

5
3
)+0.2,

=-

1
25
×(-
5
3
)+
1
5

=

4
15

(4)原式=(50-28+33-6)÷49,

=49÷49,

=1;

(5)原式=4x-x+3y,

=3x+3y;

(6)原式=15a2b-5ab2+4ab2-12a2b,

=3a2b-ab2

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