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人気のある代数 >

log_{2}(100)=n-2log_{2}(n)

解

lo g_{2} (100) = n - 2 lo g_{2} (n)

解

n = - \frac{2 W _{- 1} ( - \frac{l n ( 2 )}{20} )}{ln ( 2 )}, n = - \frac{2 W _{0} ( - \frac{l n ( 2 )}{20} )}{ln ( 2 )}

+1

十進法表記

n = 14.32472 \dots, n = 0.10365 \dots

解答ステップ

lo g_{2} (100) = n - 2 lo g_{2} (n)

辺を交換する

n - 2 lo g_{2} (n) = lo g_{2} (100)

n

を右側に移動します

- 2 lo g_{2} (n) = lo g_{2} (100) - n

以下で両辺を割る

- 2

lo g_{2} (n) = - \frac{lo g _{2} ( 100 ) - n}{2}

対数の規則を適用する

lo g_{2} (n) = - \frac{2 lo g _{2} ( 10 ) - n}{2}

f (x) = g (x)

ならば,

a^{f (x)} = a^{g (x)}

2^{l o g_{2} (n)} = 2^{- \frac{2 l o g _{2} ( 10 ) - n}{2}}

簡素化

2^{l o g_{2} (n)} : n

n = 2^{- \frac{2 l o g _{2} ( 10 ) - n}{2}}

解く

n = 2^{- \frac{2 l o g _{2} ( 10 ) - n}{2}} : n = - \frac{2 W _{- 1} ( - \frac{l n ( 2 )}{20} )}{ln ( 2 )}, n = - \frac{2 W _{0} ( - \frac{l n ( 2 )}{20} )}{ln ( 2 )}

n = - \frac{2 W _{- 1} ( - \frac{l n ( 2 )}{20} )}{ln ( 2 )}, n = - \frac{2 W _{0} ( - \frac{l n ( 2 )}{20} )}{ln ( 2 )}

解を検算する:

n = - \frac{2 W _{- 1} ( - \frac{l n ( 2 )}{20} )}{ln ( 2 )}

真

, n = - \frac{2 W _{0} ( - \frac{l n ( 2 )}{20} )}{ln ( 2 )}

真

解答は

n = - \frac{2 W _{- 1} ( - \frac{l n ( 2 )}{20} )}{ln ( 2 )}, n = - \frac{2 W _{0} ( - \frac{l n ( 2 )}{20} )}{ln ( 2 )}

グラフ

人気の例

ln(7)=ln(q^2)+5-ln(10)

ln (7) = ln (q^{2}) + 5 - ln (10)

log_{10}(x)=130

lo g_{10} (x) = 130

solvefor x,ln(y)=x+ln(x-5)+c

so l v e f or x, ln (y) = x + ln (x - 5) + c

log_{5}(1log_{3}(x))=0

lo g_{5} (1 lo g_{3} (x)) = 0

ln(x)=ln(x-1)+1

ln (x) = ln (x - 1) + 1