题目内容
计算或化简.
(1)(-5)×2+20÷(-4)
(2)-14-
×[2-(-3)2]
(3)24×(
-
-
)+(-
)2÷(-
)
(4)化简:-
(9a-3)+2(a+1)
(1)(-5)×2+20÷(-4)
(2)-14-
1 |
6 |
(3)24×(
1 |
6 |
3 |
4 |
5 |
8 |
1 |
3 |
1 |
72 |
(4)化简:-
1 |
3 |
(1)(-5)×2+20÷(-4)
=-10-5
=-15;
(2)-14-
×[2-(-3)2]
=-1-
×(2-9)
=-1-
×(-7)
=-1+
=
;
(3)24×(
-
-
)+-1÷(-
)
=4-18-15+
×(-72)
=-29-8
=-37;
(4)-
(9a-3)+2(a+1)
=-3a+1+2a+2
=-a+3.
=-10-5
=-15;
(2)-14-
1 |
6 |
=-1-
1 |
6 |
=-1-
1 |
6 |
=-1+
6 |
7 |
=
1 |
6 |
(3)24×(
1 |
6 |
3 |
4 |
5 |
8 |
1 |
72 |
=4-18-15+
1 |
9 |
=-29-8
=-37;
(4)-
1 |
3 |
=-3a+1+2a+2
=-a+3.
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