题目内容

计算或化简
(1)(-3)+(-4)-(+11)-(-9);
(2)(
2
3
-
1
12
-
1
15
)×(-60)

(3))23÷[(-3)3-(-4)];
(4)-14÷(-5)2×(-
5
3
)+|0.8-1|

(5)2a3b-
1
2
a3b-a2b+
1
2
a2b-ab2

(6)2(2a2+9b)+3(-5a2-4b)
(1)原式=-3-4-11+9
=-7-11+9
=-18+9
=-9;

(2)原式=
2
3
×(-60)-
1
12
×(-60)-
1
15
×(-60)
=-40+5+4
=-31;

(3)原式=23÷[-27+4]
=23÷(-23)
=-1;

(4)原式=-1÷25×(-
5
3
)+0.2
=-
1
25
×(-
5
3
)+0.2
=
1
15
+0.2
=
4
15


(5)原式=(2-
1
2
)a3b-(1-
1
2
)a2b-ab2
=
3
2
a3b-
1
2
a2b-ab2

(6)原式=4a2+18b-15a2-12b
=-11a2+6b.
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