
利用因式分解计算:(2^n+4-2乘以2^n)/(2乘以2^n+3)
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(2^n+4-2乘以2^n)/(2乘以2^n+3)
=(2^n+4 -2^n+1)/2^n+4
=2^n+4/2^n+4 - 2^n+1 /2^n+4
=1- 2^n+1 /2³×2^n+1
=1-1/2³
=1-1/8
=7/8
不懂的还可以追问!满意请及时采纳! O(∩_∩)O
=(2^n+4 -2^n+1)/2^n+4
=2^n+4/2^n+4 - 2^n+1 /2^n+4
=1- 2^n+1 /2³×2^n+1
=1-1/2³
=1-1/8
=7/8
不懂的还可以追问!满意请及时采纳! O(∩_∩)O
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