急！！！！！！ 帮帮忙！！！！ T^T 数学。！
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①(x²顷简+y²游乎肆)/(x-y)-2xy/(x-y)
=(x²+y²-2xy)/(x-y)
=(x-y)²/(x-y)
=x-y
②a²/(a+1)-1/(a+1)
=(a²-1)/(a+1)
=(a+1)(a-1)/神轿(a+1)
=a-1
❸2/(x²-9)÷1/(x-3)
=2/(x-3)(x+3)×(x-3)
=2/(x+3)
=(x²+y²-2xy)/(x-y)
=(x-y)²/(x-y)
=x-y
②a²/(a+1)-1/(a+1)
=(a²-1)/(a+1)
=(a+1)(a-1)/神轿(a+1)
=a-1
❸2/(x²-9)÷1/(x-3)
=2/(x-3)(x+3)×(x-3)
=2/(x+3)
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