先化简再求值[1/(x²+4x+4)+1/x²+2x]÷(x+1)/(x+2),其中x=3先化简再求值[1/(x²+4x+4)+1/x²+2x]÷(x+1)/(x+2)其中x=3今天圣诞节,也祝各位圣诞快乐

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先化简再求值[1/(x²+4x+4)+1/x²+2x]÷(x+1)/(x+2),其中x=3先化简再求值[1/(x²+4x+4)+1/x²+2x]÷(x+1)/(

先化简再求值[1/(x²+4x+4)+1/x²+2x]÷(x+1)/(x+2),其中x=3先化简再求值[1/(x²+4x+4)+1/x²+2x]÷(x+1)/(x+2)其中x=3今天圣诞节,也祝各位圣诞快乐
先化简再求值[1/(x²+4x+4)+1/x²+2x]÷(x+1)/(x+2),其中x=3
先化简再求值
[1/(x²+4x+4)+1/x²+2x]÷(x+1)/(x+2)
其中x=3
今天圣诞节,也祝各位圣诞快乐

先化简再求值[1/(x²+4x+4)+1/x²+2x]÷(x+1)/(x+2),其中x=3先化简再求值[1/(x²+4x+4)+1/x²+2x]÷(x+1)/(x+2)其中x=3今天圣诞节,也祝各位圣诞快乐
[1/(x²+4x+4)+1/(x²+2x)]÷(x+1)/(x+2)
=[1/(x+2)²+1/x(x+2)]÷(x+1)/(x+2)
=[1/(x+2)+1/x]÷(x+1)
=[(x+x+2)/x(x+2)]÷(x+1)
=2(x+1)/x(x+2)÷(x+1)
=2/x(x+2)
=2/[3*(3+2)]
=2/15
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