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数学
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如果x=1+2^b,y=1+2^-b,那么y等于 ( )
A.x+1/x-1 B x-1/x C x-1/x+1 D x/x-1
人气:182 ℃ 时间:2020-05-06 15:36:47
解答
x=1+2^b 移项得 2^b=x-1
y = 1+2^-b = 1+1/2^b
将2^b=x-1代入得 y= 1+1/(x-1) = (x-1+1)/(x-1) = x/(x-1)
答案选择D
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