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1/4(x-y)^2+x-y+1
人气:157 ℃ 时间:2020-05-14 13:23:07
解答
1/4(x-y)^2+x-y+1
=[0.5(x-y)]^2+2*0.5(x-y)+1
=[0.5(x-y)+1]^2
=[0.5x-0.5y+1]^2
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