问题
计算题
化简 (1)2a+2(2a+1)﹣3(a﹣2)
(2)5xy2﹣3[2x2y﹣2(x2y﹣2xy2)].
答案
解:(1)2a+2(2a+1)﹣3(a﹣2),
=2a+4a+2﹣3a+6,
=3a+8;
(2)5xy2﹣3[2x2y﹣2(x2y﹣2xy2)],
=5xy2﹣6x2y+6(x2y﹣2xy2),
=5xy2﹣6x2y+6x2y﹣12xy2,
=﹣7xy2.
化简 (1)2a+2(2a+1)﹣3(a﹣2)
(2)5xy2﹣3[2x2y﹣2(x2y﹣2xy2)].
解:(1)2a+2(2a+1)﹣3(a﹣2),
=2a+4a+2﹣3a+6,
=3a+8;
(2)5xy2﹣3[2x2y﹣2(x2y﹣2xy2)],
=5xy2﹣6x2y+6(x2y﹣2xy2),
=5xy2﹣6x2y+6x2y﹣12xy2,
=﹣7xy2.