题目内容

整式加减计算题:
(1)3a2-2a-4a2-7a;
(2)3a2+5-2a2-2a+3a-8;
(3)(7m2n-5mn)-(4m2n-5mn);
(4)
1
3
(9a-3)+2(a+1)
(1)原式=3a2-4a2-2a-7a
=-a2-9a;

(2)原式=3a2-2a2-2a+3a+5-8
=a2+a-3;

(3)原式=7m2n-5mn-4m2n+5mn
=7m2n-4m2n-5mn+5mn
=3m2n;

(4)原式=3a-1+2a+2
=3a+2a-1+2
=5a+1.
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