log2(x+14)(x+2)=log2 8+log2(x+6) 2都在下面的
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log2(x+14)(x+2)=log2 8+log2(x+6) 2都在下面的
log2(x+14)(x+2)=log2 8+log2(x+6) 2都在下面的
log2(x+14)(x+2)=log2 8+log2(x+6) 2都在下面的
log(x+14)(x+2)=log 8+log(x+6)
(x+14)(x+2) = 8(x+6)
x^2+8x-20 =0
(x+10)(x-2)=0
x=2 or -10( rej)
ie x=2
log2 (x+14)(x+2)=log2 8(x+6)
x^2+16x+28=8x+48
x^2+8x-20=0
(x+10)(x-2)=0
x=-10或2
考虑定义域(x+14)(x+2)>0且x+6>0
x>-2
所以x=2
log2(x+14)(x+2)=log2 8+log2(x+6) 2都在下面的
log2^(x^log2^x)=?
已知函数f(x)=log2^ ( x/4 ) ×log2^ (2x) (1)解不等式f(x)>0;(2)当x∈【1,4】时,求f(x)的值域f(x)=log2(2x)×log2(x/4)=[(log2 2)+(log2 x)] ×[(log2 x) -(log2 4)]=[1+(log2 x)] ×[(log2 x) -2]=(log2 x)² - (log2 x) -2
解方程log2(x+14)-log2(x+6)=3-log2(x+2)
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log2(2^x-1)log2(2^(x+2)-4=3log2(2^x-1)log2(2^(x+2)-4)=3
log2 (x + 3) + log2(x + 2) = 1log2 (x + 3) + log2(x + 2) = 1
解关于x的方程:log2(x+14)-log0.5(x+2)=3+log2(x+6)
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