(3a的平方-ab+7)-(-4a的平方+2ab+7)
初一数学题,不用计算出ab等的值……各位,拜托啦!
人气：119 ℃ 时间：2019-12-07 03:56:11
解答
(3a的平方-ab+7)-(-4a的平方+2ab+7)
=3a^2-ab+7+4a^2-2ab-7
=7a^2-3ab
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