规定一种新运算:a※b=(a+b)b,则(x+y)※(x-y)=

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规定一种新运算:a※b=(a+b)b,则(x+y)※(x-y)=

规定一种新运算:a※b=(a+b)b,则(x+y)※(x-y)=
规定一种新运算:a※b=(a+b)b,则(x+y)※(x-y)=

规定一种新运算:a※b=(a+b)b,则(x+y)※(x-y)=
2X^2 - 2XY