9(x-y)^2+42(x-y)+49 16(x+y)2+40(x+y)(x-y)+25(x-y)^2 你懂的……没分了= =谅解..
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9(x-y)^2+42(x-y)+49 16(x+y)2+40(x+y)(x-y)+25(x-y)^2 你懂的……没分了= =谅解..
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