(1)x/(6ab²),y/(9a²bc)(2)(a-1)/(a²+2a+1),6/(a²-1)

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(1)x/(6ab²),y/(9a²bc)(2)(a-1)/(a²+2a+1),6/(a²-1)
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(1)x/(6ab²),y/(9a²bc)(2)(a-1)/(a²+2a+1),6/(a²-1)
(1)x/(6ab²),y/(9a²bc)
(2)(a-1)/(a²+2a+1),6/(a²-1)

(1)x/(6ab²),y/(9a²bc)(2)(a-1)/(a²+2a+1),6/(a²-1)
(1)最简公分母是:18a²b²c
x/(6ab²)=3xac/18a²b²c
y/(9a²bc)=2yb/18a²b²c
(2)最简公分母是:(a+1)²(a-1)
(a-1)/(a²+2a+1)=(a-1)/(a+1)²=(a-1)²/(a+1)²(a-1)
6/(a²-1)=6/(a+1)(a-1)=6(a+1)/(a+1)²(a-1)