ⅹ²-1/x²+3x+2乘ⅹ²-3x-10/2ⅹ-2?
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书写如下:
(X²-1)/(X²+3X+2)×(X²-3X-10)/(2X-2)
=(X+1)(X-1)/[(X+1)(X+2)]×(X-5)(X+2)/[2(X-1)]
=(X-1)/(X+2)×(X-5)(X+2)/[2(X-1)]
=(X-5)/2
(X²-1)/(X²+3X+2)×(X²-3X-10)/(2X-2)
=(X+1)(X-1)/[(X+1)(X+2)]×(X-5)(X+2)/[2(X-1)]
=(X-1)/(X+2)×(X-5)(X+2)/[2(X-1)]
=(X-5)/2
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