题目内容

计算
(1)-9+12-3+8                     
(2)2
1
7
-3
2
3
-5
1
3
+(-3
1
7

(3)48×(-
1
6
+
3
4
-
1
12

(4)-|-9|×|-1
2
3
|-(-10)
(5)-14-
1
6
×[2-(-3)2]
(6)18×(-
2
3
)+13×
2
3
-4×
2
3
分析:(1)(2)分类计算即可;
(3)(6)利用乘法分配律简算;
(4)先算绝对值,再算乘法,再算减法;
(5)先算乘方,再算括号里面的减法,再算乘法,最后算减法.
解答:解:(1)-9+12-3+8
=-9-3+12+8
=-12+20
=8;
                     
(2)2
1
7
-3
2
3
-5
1
3
+(-3
1
7

=2
1
7
+(-3
1
7
)-3
2
3
-5
1
3

=-1-9
=-10;

(3)48×(-
1
6
+
3
4
-
1
12

=48×(-
1
6
)+48×
3
4
-48×
1
12

=-8+36-4
=24;

(4)-|-9|×|-1
2
3
|-(-10)
=-9×
5
3
+10
=-15+10
=-5;

(5)-14-
1
6
×[2-(-3)2]
=-1-
1
6
×[2-9]
=-1-
1
6
×[-7]
=-1+
7
6

=
1
6


(6)18×(-
2
3
)+13×
2
3
-4×
2
3

=(-18+13-4)×
2
3

=-9×
2
3

=-6.
点评:此题考查有理数的混合运算,注意运算顺序与运算定律的运用.
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