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有理数ab定义:a*b=3a+2b.则[(x+y)*(x-y)]*3x.怎么化简?
人气:133 ℃ 时间:2019-10-11 18:58:45
解答
[(x+y)*(x-y)]*3x
=[3(x+y)+2(x-y)]*3x
=(5x+y)*3x
=3(5x+y)+2*3x
=21x+3y
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