先化简(x的二次方-1分之4x+5-x-1分之3)除以x的二次方-2x+1分之x+2,其中x等于3 怎么做？？？

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=[(4x+5)/圆轿轮橘信(x+1)(x-1)-3(x+1)/(x+1)(x-1)]÷(x+2)/帆源(x+1)(x-1)
=[(4x+5)-3(x+1)]/(x+1)(x-1) ×(x+1)(x-1)/(x+2)
=(x+2)/(x+2)
=1
当x=3时 原式=1

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