log2(3),log2(3^x-1),log2(3^x+37/3)成等差数列,求x
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log2(3),log2(3^x-1),log2(3^x+37/3)成等差数列,求xlog2(3),log2(3^x-1),log2(3^x+37/3)成等差数列,求xlog2(3),log2(3^x
log2(3),log2(3^x-1),log2(3^x+37/3)成等差数列,求x
log2(3),log2(3^x-1),log2(3^x+37/3)成等差数列,求x
log2(3),log2(3^x-1),log2(3^x+37/3)成等差数列,求x
log2(3),log2(3^x-1),log2(3^x+37/3)成等差数列
则有:
2log2(3^x-1)=log2(3)+log2(3^x+37/3)
log2(3^x-1)^2=log2(3(3^x+37/3))
(3^x-1)^2=3^(x+1)+37
解方程:令3^x=a>0
(a-1)^2=3a+37
a^2-2a+1-3a-37=0
a^2-5a-36=0
(a-9)(a+4)=0
a=9,(负值舍去)
所以
3^x=9
x=2
经检验是符合要求的,
所以所求的x
是x=2
log2(3)+ log2(3^x+37/3)=2log2(3^x-1)
3*(3^x+37/3)=(3^x-1)^2
3^2x-5*3^x-36=0
设3^x=t, 即 t^2-5t-36=0
解得 t=9或-4(舍去)
所以 3^x=t=9
x=2
|[log2(x)]^2-3log2(x)+1|
log2(x+1)>log2(3-x)
log2 (x + 3) + log2(x + 2) = 1log2 (x + 3) + log2(x + 2) = 1
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