3(x+y)²-7(x+y)+8(x+y)²+6(x+y) 要过程,否则不采纳!化简

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3(x+y)²-7(x+y)+8(x+y)²+6(x+y)要过程,否则不采纳!化简3(x+y)²-7(x+y)+8(x+y)²+6(x+y)要过程,否则不采纳!

3(x+y)²-7(x+y)+8(x+y)²+6(x+y) 要过程,否则不采纳!化简
3(x+y)²-7(x+y)+8(x+y)²+6(x+y) 要过程,否则不采纳!化简