已知：4x-y=0,化简分式x²+3y/2y-3x.

已知：4x-y=0,化简分式x²+3y/2y-3x.
已知：4x-y=0,化简分式x²+3y/2y-3x.

已知：4x-y=0,化简分式x²+3y/2y-3x.
∵4x-y=0
∴y=4x
∴(x²+3y)/(2y-3x)
=(x²+12x)/(8x-3x)
=[x(x+12)]/(5x)
=(x+12)/5

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（x+12)÷5
由y=4x
可得
(x²+12x)÷(8x-3x)
=(x+12)÷5