计算,（a²-1）/（a²+4a+4）÷（a+1）/（a+2）
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计算,（a²-1）/（a²+4a+4）÷（a+1）/（a+2）计算,（a²-1）/（a²+4a+4）÷（a+1）/（a+2）计算,（a²-1）/（a&
计算,（a²-1）/（a²+4a+4）÷（a+1）/（a+2）
计算,
（a²-1）/（a²+4a+4）÷（a+1）/（a+2）
计算,（a²-1）/（a²+4a+4）÷（a+1）/（a+2）
[（a²-1）/（a²+4a+4）]÷[（a+1）/（a+2）]
=[(a²-1)/(a+1)]/[(a²+4a+4)/(a+2)]
=(a-1)/(a+2)
原式=（a+1）（a-1）/（a+2）² ×（a+2）/（a+1）
=[（a+1）（a-1）（a+2）]/[（a+2）²（a+1）]
=（a-1）/（a+2）