通分__x ,___2__ 3(y-1) __x ,___2___3(y-1) 6-6y

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通分__x ,___2__ 3(y-1) __x ,___2___3(y-1) 6-6y
x){0iG[||N||Q|FP

通分__x ,___2__ 3(y-1) __x ,___2___3(y-1) 6-6y
通分__x ,___2__ 3(y-1)
__x ,___2___
3(y-1) 6-6y

通分__x ,___2__ 3(y-1) __x ,___2___3(y-1) 6-6y
前一个不变x/3(y-1) 后一个先约分然后提负号即可 -1/3(y-1)