化简分式;(1)3xy/42x-3xy(2)a-b/a²-b²(3)x²+2xy+y²/2x+2y(4)12a³(y-x)²/27(x-y)

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化简分式;(1)3xy/42x-3xy(2)a-b/a²-b²(3)x²+2xy+y²/2x+2y(4)12a³(y-x)²/27(x-y)

化简分式;(1)3xy/42x-3xy(2)a-b/a²-b²(3)x²+2xy+y²/2x+2y(4)12a³(y-x)²/27(x-y)
化简分式;(1)3xy/42x-3xy(2)a-b/a²-b²(3)x²+2xy+y²/2x+2y
(4)12a³(y-x)²/27(x-y)

化简分式;(1)3xy/42x-3xy(2)a-b/a²-b²(3)x²+2xy+y²/2x+2y(4)12a³(y-x)²/27(x-y)
⑴原式=Y/(14X-Y)
⑵原式=1/(a-b)
⑶原式=(X+Y)/2
⑷4 a^3(X-Y)/9.