计算：（a-1）/（a+2）•[（a²+4a+4）/（a-1）]-2

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计算：（a-1）/（a+2）•[（a²+4a+4）/（a-1）]-2计算：（a-1）/（a+2）•[（a²+4a+4）/（a-1）]-2计算：（a-1）/（

计算：（a-1）/（a+2）•[（a²+4a+4）/（a-1）]-2
计算：（a-1）/（a+2）•[（a²+4a+4）/（a-1）]-2

计算：（a-1）/（a+2）•[（a²+4a+4）/（a-1）]-2
（a-1）/（a+2）•[（a²+4a+4）/（a-1）]-2
=（a-1）/（a+2）•[(a+2)²/(a-1)]-2
=a+2-2
=a

（a- 1）/（a+2）•[（a²+4a+4）/（a-1）]-2
=（a+2）-2
=a