题目内容

计算或化简.
(1)(-5)×2+20÷(-4)
(2)-14-
1
6
×[2-(-3)2]
(3)24×(
1
6
-
3
4
-
5
8
)+(-
1
3
2÷(-
1
72

(4)化简:-
1
3
(9a-3)+2(a+1)
(1)(-5)×2+20÷(-4)
=-10-5
=-15;

(2)-14-
1
6
×[2-(-3)2]
=-1-
1
6
×(2-9)
=-1-
1
6
×(-7)
=-1+
6
7

=
1
6


(3)24×(
1
6
-
3
4
-
5
8
)+-1÷(-
1
72

=4-18-15+
1
9
×(-72)
=-29-8
=-37;

(4)-
1
3
(9a-3)+2(a+1)
=-3a+1+2a+2
=-a+3.
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