原式=15a²b-ab²-3a²b
=12a²b-ab²
先化简,再求值5(3a平方b)—(ab平方b+3a平方b)
先化简,再求值5(3a平方b)—(ab平方b+3a平方b)
平方(2)打不出来了!
平方(2)打不出来了!
数学人气:146 ℃时间:2019-10-29 06:18:07
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