x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x²
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x²/xy-x/y3x/4x+y-x-2y/4x+y(1-y/y+x)÷x/y²-x²x²/xy-x/y3x/4x+y-x-2y/4x+y(1-y/y+x)÷x
x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x²
x²/xy-x/y
3x/4x+y - x-2y/4x+y
(1-y/y+x)÷x/y²-x²
x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x²
求数学达人来解答
x²/xy-x/y=(1-x)/y
3x/4x+y - x-2y/4x+y=(3x-x-2y)/(4x+y)
(1-y/y+x)÷x/y²-x²=(1-y)*(y+x)(y-x)/(y+x)*x=(1-y)(y-x)/x=(y-x-y²+xy)/x