用完全平方公式解答,明天就开学啦,速度的话追分1.(三分之一x+3y)²= ( )²=四分之一y²-y+12.(a+b-c)²= 3.代数式2xy-x²-y²等于4(x+y/2)²-(x-y/2)²等于5.已知x-y=4,xy=12,则x

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