通分:1/(X+2),4X/(X2-4),2/((2-X)

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通分:1/(X+2),4X/(X2-4),2/((2-X)
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通分:1/(X+2),4X/(X2-4),2/((2-X)
通分:1/(X+2),4X/(X2-4),2/((2-X)

通分:1/(X+2),4X/(X2-4),2/((2-X)
(X-2)/(X^2-4),4X/(X^2-4),-2(X+2)/(X^2-4)