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(x+y)和(x-y)各看成一个整体,合并同类项2(x+y)-3(x-y)²+3(x+y)+4(x-y)²
人气:381 ℃ 时间:2020-01-27 21:13:39
解答
2(x+y)-3(x-y)²+3(x+y)+4(x-y)²
=(2+3)(x+y)+(-3+4)(x-y)²
=5(x+y)+(x-y)²
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