a²+ab-2b²/a²-b²=( )/a+b ,x-y/2a=(y-x)²/( )填空 分式
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a²+ab-2b²/a²-b²=( )/a+b ,x-y/2a=(y-x)²/( )填空 分式
a²+ab-2b²/a²-b²=( )/a+b ,x-y/2a=(y-x)²/( )填空 分式
a²+ab-2b²/a²-b²=( )/a+b ,x-y/2a=(y-x)²/( )填空 分式
a²+ab-2b²/a²-b²=( a+2b)/a+b ,
x-y/2a=(y-x)²/( a(x-y) )