Trả lời :

16 : 2x = 72

=> 2x = 16 : 72

=> 2x = \(\frac{2}{9}\)

=> x = \(\frac{1}{9}\)

~Std well~

#Thạc_Trân

Trả lời

16:2x=72

     2x=16:72

     2x=2/9

       x=2/9:2

       x=1/9

16:2x=72

2x=72/16

2x=9/2

x=9/4

Ta có: |15/32 - x| ≥ 0; |4/25 - y| ≥ 0; |z - 14/31| ≥ 0

=> |15/32 - x| +|4/25 - y|+ |z - 14/31| ≥ 0

Mà |15/32 - x| +|4/25 - y|+ |z - 14/31| < 0

=> x, y, z ∈ \(\varnothing\) 

\(a,18.\left(x-16\right)=18\)

\(x-16=18:18\)

\(x-16=1\)

\(x=16+1\)

\(x=17\)

\(b,45.\left(11-x\right)=45\)

\(11-x=45:45\)

\(11-x=1\)

\(x=11-1\)

\(x=10\)

\(18.\left(x-16\right)=18\)

\(=>x-16=1\)

\(=>x=17\)

\(45\left(11-x\right)=45\)

\(=>11-x=1\)

\(=>x=10\)

Ủng hộ mik nha

Thanks

\(x=10\)

=>x*20%+x*80%=32

=>x*1=32

=>x=32

`x : 5 + x xx 80%=32`

`=> x xx 1/5 + x xx 4/5=32`

`=> x xx (1/5 +4/5)=32`

`=> x xx 1 =32`

`=>x=32:1`

`=>x=32`

\(-13.\left|x\right|=-26\)

\(\Rightarrow\left|x\right|=\frac{-26}{-13}=2\)

\(\Rightarrow\orbr{\begin{cases}x=2\\x=-2\end{cases}}\)

Vậy ....

Hok tốt!!

\(\Rightarrow|x|=\left(-26\right):\left(-13\right)\)

\(\Rightarrow|x|=2\)

\(\Rightarrow x=2;-2\)

-13.|x|=-26

|x|=-26:-13

|x|=2

x=2 hoặc x=-2

k cho mk nha

1/4×2/6×3/8×4/10×...×14/30×15/32=1/2^x

<=>1/(2×2)×2/(2×3)×...×14/(2×15)×15/2^5=1/2^x

<=>1/2×1/2×...×1/2×1/(2^5)=1/2^x

<=>1/2^19=1/2^x=>x=19

Đề mình không ghi lại nhé.

^{\(\Rightarrow\frac{1\times2\times3\times4\times...\times14\times15}{4\times6\times10\times...\times30\times32}=\frac{1}{2^x}\)}\(\frac{1}{2^x}\)

\(\Rightarrow\frac{1\times2\times3\times4\times...\times14\times15}{2\times4\times6\times8\times10\times...\times30\times32}\)\(=\frac{1}{2^{x+1}}\)

\(\Rightarrow\frac{1}{2^{15}\times32}=\)\(\frac{1}{2^{x+1}}\)

\(\Rightarrow2^{15}\times2^5=2^{x+1}\)

\(\Rightarrow2^{20}=2^{x+1}\)

\(\Rightarrow x+1=20\Rightarrow x=19\)

Vậy \(x=1\)

Học tốt nhaaa!

Vậy x = 19 nha cậu ơi! Lỗi kỹ thuật xíu!

Ta có:

\(254=14x+16\\ \Rightarrow14x=238\\ \Rightarrow x=17\)

có ai giải giúp mình ko mình đang gấp huhu

2^x x 16 = 128 

2^x          = 128 : 16

2 ^x        = 8

2^x         = 2³

3^x : 9 = 27 

3^x      = 27 x 9

3^x      =243

3^x      = 3⁵

[ 2^x + 1 ]³ = 27

2^x3 + 1³   = 27

2^x3 +1      = 27

2^x3           = 27 - 1

2^x3           = 26