4(a-b)2-2(a-b)+5(a-b)+3(a-b)2
=4(a-b)2+3(a-b)2-2(a-b)+5(a-b)
=7(a-b)2+3(a-b).
把(a-b)当成一个整体合并同类项:4(a-b)2-2(a-b)+5(a-b)+3(a-b)2=_.
把(a-b)当成一个整体合并同类项:4(a-b)2-2(a-b)+5(a-b)+3(a-b)2=______.
数学人气:324 ℃时间:2019-11-21 02:34:20
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