题目内容
化简: (1)2(2a2+9b)+3(﹣5a2﹣4b)
(2)2a﹣3b+[4a﹣(3a﹣b)].
(2)2a﹣3b+[4a﹣(3a﹣b)].
解:(1)原式=4a2+18b﹣15a2﹣12b,
=﹣11a2+6b.
(2)原式=2a﹣3b+[4a﹣3a+b],
=2a﹣3b+4a﹣3a+b,
=3a﹣2b.
=﹣11a2+6b.
(2)原式=2a﹣3b+[4a﹣3a+b],
=2a﹣3b+4a﹣3a+b,
=3a﹣2b.
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