通分(1)2/3a与3/-4ab²(2)2c/3a²b²,3a/-4b³c与-4b/5ac³(3)/x-y与2/x²-y²(4)2/x²-9与x/6-2x(5)x-y与2y²/x+y
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通分(1)2/3a与3/-4ab²(2)2c/3a²b²,3a/-4b³c与-4b/5ac³(3)/x-y与2/x²-y²(4)2/x²-9与x/6-2x(5)x-y与2y²/x+y
通分(1)2/3a与3/-4ab²
(2)2c/3a²b²,3a/-4b³c与-4b/5ac³
(3)/x-y与2/x²-y²
(4)2/x²-9与x/6-2x
(5)x-y与2y²/x+y
通分(1)2/3a与3/-4ab²(2)2c/3a²b²,3a/-4b³c与-4b/5ac³(3)/x-y与2/x²-y²(4)2/x²-9与x/6-2x(5)x-y与2y²/x+y
(1)2/3a与3/-4ab²
2/3a=8b²/12ab²
3/-4ab²=-3/4ab²
(2)2c/3a²b²,3a/-4b³c与-4b/5ac³
2c/3a²b²=40bc²/60a²b³c³
3a/-4b³c=-45ac²/60a²b³c³
-4b/5ac³=-48ab³/60a²b³c³
(3)1/x-y与2/x²-y²
1/(x-y)=(x+y)/(x-y)(x+y)
2/(x²-y²)=2/(x-y)(x+y)
(4)2/x²-9与x/6-2x
2/(x²-9)=6/3(x-3)(x+3)
x/(6-2x)=-x(x+3)/3(x-3)(x+3)
(5)x-y与2y²/x+y
(x-y)=(x-y)(x+y)/(x+y)
2y²/(x+y)