（xy-x²）/x-y/xy=？ 3x-6/x²-4÷x+2/x²+4x+4=?
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1.（xy-x²）/x-y/xy
=x(y-x)/x-y/xy
=1/(y-x)-1/x
=[x-(y-x)]/[x(y-x)]
=(2x-y)/(xy-x²)
2. (3x-6)/(x²-4)÷(x+2)/(x²+4x+4)
=[3(x-2)/(x+2)(x-2)]÷[(x+2)/(x+2)²]
=[3/(x+2)]÷[1/(x+2)]
=[3/(x+2)]×(x+2)
=3
=x(y-x)/x-y/xy
=1/(y-x)-1/x
=[x-(y-x)]/[x(y-x)]
=(2x-y)/(xy-x²)
2. (3x-6)/(x²-4)÷(x+2)/(x²+4x+4)
=[3(x-2)/(x+2)(x-2)]÷[(x+2)/(x+2)²]
=[3/(x+2)]÷[1/(x+2)]
=[3/(x+2)]×(x+2)
=3
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