一道分式方程如何化简(X/X-1)-( 3/(X-1)(X+2) ) -1

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一道分式方程如何化简(X/X-1)-( 3/(X-1)(X+2) ) -1
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一道分式方程如何化简(X/X-1)-( 3/(X-1)(X+2) ) -1
一道分式方程如何化简
(X/X-1)-( 3/(X-1)(X+2) ) -1

一道分式方程如何化简(X/X-1)-( 3/(X-1)(X+2) ) -1
原式=X(X+2)/(X-1)(X+2)-3/(X-1)(X+2)-(X-1)(X+2)/(X-1)(X+2)
=(X²+2X-3-X²-X+2)/(X-1)(X+2)
=(X-1)/(X-1)(X+2)
=1/(X+2)