∵y分之x=5
∴x=5y
(4x²-5xy-6y²)分之(x²-2xy+3y²)
=(100y²-25y²-6y²)分之(25y²-10y²+3y²)
=(69y²)分之(18y²)
=23分之6
明白请采纳,
有新问题请求助,