已知y=3xy+x,求代数式2x+3xy-2y⼀x-2xy-y的值

2024-12-23 06:09:51
推荐回答(2个)
回答1:

由y=3xy+x可得:x-y=-3xy
2x+3xy-2y/x-2xy-y
=2(x-y)+3xy/(x-y)-2xy
=(-6xy+3xy)/(-3xy-2xy)
=-3xy/-5xy
=3/5

回答2:

y=3xy+x
则x-y=-3xy
2x+3xy-2y/x-2xy-y
=2(x-y)+3xy/(x-y)-2xy
=-6xy+3xy/-3xy-2xy
=-3xy/-5xy
=3/5