题目内容

(1)12+(-18);
(2)-7-15;
(3)12-(-18)+(-7)-15;
(4)3a2-2a+4a2-7a;
(5)(
1
6
-
3
4
+
5
12
)×12;
(6)-14-
1
7
×
(2-32);
(7)6.868×(-5)+6.868×(-12)+17×6.868;
(8)-32-|(-5)3|×(-
2
5
2-18÷|(-3)2|.
(1)原式=-(18-12)
=-6;

(2)原式=-(7+15)
=-22;

(3)原式=12+18-7-15
=30-22
=8;

(4)原式=7a2-9a;

(5)原式=2-9+5=-2;

(6)原式=-1-
1
7
×(-7)
=-1+1
=0;

(7)原式=6.868×(-5-12+17)
=0;

(8)原式=-9-125×
4
25
-18÷9
=-9-20-2
=-31.
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