计算:x-y分之x - x+y分之y + x²-y²分之2xy 计算:a-1分之2a+2 除以 (a+1) -(1)计算:x-y分之x - x+y分之y + x²-y²分之2xy(2)计算:a-1分之2a+2 除以 (a+1) - a²-2x+1分之a²-1
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