2/(a-2)+(a²-4a+4)/(a²-1)÷(a-2)/(a+1)·····先化简再求值：2/(a-2)+(a²-4a+4)/(a²-1)÷(a-2)/(a+1)其中a=1+根号2

2/(a-2)+(a²-4a+4)/(a²-1)÷(a-2)/(a+1)·····先化简再求值：2/(a-2)+(a²-4a+4)/(a²-1)÷(a-2)/(a+1)其中a=1+根号2
2/(a-2)+(a²-4a+4)/(a²-1)÷(a-2)/(a+1)·····
先化简再求值：2/(a-2)+(a²-4a+4)/(a²-1)÷(a-2)/(a+1)其中a=1+根号2

2/(a-2)+(a²-4a+4)/(a²-1)÷(a-2)/(a+1)·····先化简再求值：2/(a-2)+(a²-4a+4)/(a²-1)÷(a-2)/(a+1)其中a=1+根号2
2/(a-2)+(a²-4a+4)/(a²-1)÷(a-2)/(a+1）
=2/(a-2)+(a-2)²/([(a+1)(a-1)]×(a+1)/(a-2)
=2/(a-2)+(a-2)/(a-1)
=[2(a-1)+(a-2)²]/[(a-2)(a-1)]
=[2(1+√2-1)+(1+√2-2)]/[(1+√2-2)(1+√2-1)]
={√2-1)/[(√2-1)×√2]
=(√2)/2

解:原式=2／(a-2)+(a-2)^2÷(a-2)／(a+1)
=2／(a-2)+(a-2)／(a+1)
=[2(a+1)+(a-2)^2]／(a-2)(a+1)
=(2a+2+a^2-2a+4)／(a^2-a-2)
=(a^2+6)／(a^2-a-2)
=(9+2✓2)／(3+2✓2-1-✓2-2)
=9...

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解:原式=2／(a-2)+(a-2)^2÷(a-2)／(a+1)
=2／(a-2)+(a-2)／(a+1)
=[2(a+1)+(a-2)^2]／(a-2)(a+1)
=(2a+2+a^2-2a+4)／(a^2-a-2)
=(a^2+6)／(a^2-a-2)
=(9+2✓2)／(3+2✓2-1-✓2-2)
=9✓2／2+2

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