两道计算，谢谢
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(x-2y)²+4(x-y)(x+y)
=x²-4xy+4y²+4x²-4y²
=5x²-4xy
[2x/(x-2)-x/(x+2)]÷x/(x²-4)
=[2x/(x-2)-x/(x+2)]×（x+2)(x-2)/x
=2x/(x-2)×（x+2)(x-2)/x-x/(x+2)×（x+2)(x-2)/x
=2(x+4)-(x-2)
=2x+8-x+2
=x+10
=x²-4xy+4y²+4x²-4y²
=5x²-4xy
[2x/(x-2)-x/(x+2)]÷x/(x²-4)
=[2x/(x-2)-x/(x+2)]×（x+2)(x-2)/x
=2x/(x-2)×（x+2)(x-2)/x-x/(x+2)×（x+2)(x-2)/x
=2(x+4)-(x-2)
=2x+8-x+2
=x+10
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