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30 tháng 6 2017

\(\left(x+\frac{1}{2}\right)+\left(x+\frac{1}{4}\right)+\left(x+\frac{1}{8}\right)+\left(x+\frac{1}{16}\right)=1\)

\(\left(x+x+x+x\right)+\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}\right)=1\)

\(4x+\left(1+\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}\right)=1\)

\(4x+\left(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{4}+\frac{1}{4}-\frac{1}{8}+\frac{1}{8}-\frac{1}{16}\right)=1\)

\(4x+\left(1-\frac{1}{16}\right)=1\)

\(4x+\frac{15}{16}=1\)

\(4x=\frac{1}{16}\)

\(\Rightarrow x=\frac{1}{64}\)

30 tháng 6 2017

\(\left(x+\frac{1}{2}\right)+\left(x+\frac{1}{4}\right)+\left(x+\frac{1}{8}\right)+\left(x+\frac{1}{16}\right)=1\)

\(\left(x+x+x+x\right)+\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}\right)=1\)

\(4x+\frac{15}{16}=1\)

\(4x=\frac{1}{16}\)

\(x=\frac{1}{16}\div4\)

\(x=\frac{1}{64}\)

Vậy ...

\(\left(x+\frac{1}{2}\right)+\left(x+\frac{1}{4}\right)+\left(x+\frac{1}{8}\right)+\left(x+\frac{1}{16}\right)=1\)

\(\Rightarrow\left(x+x+x+x\right)+\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}\right)=1\)

\(\Rightarrow4x+\left(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{4}+\frac{1}{4}-\frac{1}{8}+\frac{1}{8}-\frac{1}{16}\right)=1\)

\(\Rightarrow4x+1-\frac{1}{16}=1\)

\(\Rightarrow4x=1-1+\frac{1}{16}=\frac{1}{16}\)

\(\Rightarrow x=\frac{1}{16}:4=\frac{1}{64}\)

vậy \(x=\frac{1}{64}\)

29 tháng 4 2015

Ta có:

(1/2 + 1/4 + 1/8 + 1/16) = 8/16 + 4/16 + 2/16 + 1/16 = 15/16.

1/2 + 1/6 + 1/12 + 1/20 +…+ 1/132 = 1/(1.2) + 1/(2.3) + 1/(3.4) + 1/(4.5) +…+1/(11.12)

= (1 – 1/2) + (1/2 – 1/3) + (1/3 – 1/4) + (1/4 – 1/5) +…+ (1/11 – 1/12)

= 1 – 1/12 = 11/12

Vậy x = (15/16) : (11/12) = 45/44.

29 tháng 4 2015

(1/2+1/4+1/8+1/16):x=1/2+1/6+1/12+1/20+...+1/132

(1-1/2+1/2-1/4+1/4-1/8+1/8-1/16):x=1/1x2+1/2x3+1/3x4+1/4x5+...+1/11x12

(1-1/16):x=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+...+1/11-1/12

15/16:x=1-1/12

15/16:x=11/12

x=15/16:11/12

x=45/44

26 tháng 9 2017

a. x= 0

b. Bạn viết sai ak

c. x= 4

d. x= 1

e. x= 2

f. x=8

26 tháng 9 2017

à!  câu thứ 2 là:

3^x=9 nhé! sory

13 tháng 8 2016

\(\left(\frac{1}{2}+x\right)+\left(\frac{1}{4}+x\right)+\left(\frac{1}{8}+x\right)+\left(\frac{1}{16}+x\right)=1\)

         \(\left(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}\right)+\left(x+x+x+x\right)=1\)

                                                                             \(\frac{15}{16}+4x=1\)

                                                                                          \(4x=\frac{1}{16}\)

                                                                                            \(x=\frac{1}{64}\)

13 tháng 8 2016

( x + x + x + x ) + ( \(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}+\frac{1}{16}\) ) = 1

x * 4 + \(\frac{15}{16}\) = 1

x * 4 = 1 - \(\frac{15}{16}\)

x * 4 = \(\frac{1}{16}\)

x = \(\frac{1}{16}\) : 4

x = \(\frac{1}{64}\)

20 tháng 9 2020

1/2+1/4+1/6+1/8+1/16):x=3/1*2+3/2*3+3/3*4+...+3/15*16

\(\frac{53}{48}:x=3(\frac{1}{1.2}+\frac{1}{2.3}+...+\frac{1}{15.16})\)

\(\frac{53}{48}:x=3(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...+\frac{1}{15}-\frac{1}{16})\)

\(\frac{53}{48}:x=3(1-\frac{1}{16})\)

\(\frac{53}{48}:x=\frac{45}{16}\)

\(x=\frac{53}{48}:\frac{45}{16}\)

\(x=\frac{53}{135}\)

Chúc bạn học tốt

28 tháng 8 2021

1 , 10

2 , 8

3 , 5

4 , 2

5 , 1

6 ,

28 tháng 8 2021

1/ `|x|=10<=> x=\pm 10`

2/ `|x-8|=0<=>x-8=0<=>x=8`

3/ `7+|x|=12<=>|x|=5<=>x=\pm 5`

4/ `|x+1|=3`

$\Leftrightarrow\left[\begin{array}{1}x+1=3\\x+1=-3\end{array}\right.\\\Leftrightarrow\left[\begin{array}{1}x=3\\x=-4\end{array}\right.$

5/ `15-x=16-(14-42)`

`<=>15-x=16+28`

`<=>15-x=44`

`<=>x=-29`

6/ `210-(x-12)=168`

`<=>210-x+12=168`

`<=>222-x=168`

`<=>x=54`

29 tháng 7 2023

3) Tìm số tự nhiên x, biết:

a) \(2^x=4\)

\(2^x=2^2\)

\(\Rightarrow x=2\)

___________

b) \(2^x=1\)

\(2^x=2^0\)

\(\Rightarrow x=0\)

___________

c) \(2^x=16\)

\(2^x=2^4\)

\(\Rightarrow x=4\)

___________

d) \(3^x=9\)

\(3^x=3^2\)

\(\Rightarrow x=2\)

___________

e) \(5^x=125\)

\(5^x=5^3\)

\(\Rightarrow x=3\)

___________

f) \(8^x=64\)

\(8^x=8^2\)

\(\Rightarrow x=2\)

___________

h) \(3^{x+1}=3^2\)

\(\rightarrow x+1=2\)

\(x=2-1\)

\(x=1\)

\(\Rightarrow x=1\)

Chúc bạn học tốt

a: 2^x=4

=>2^x=2^2

=>x=2

b: 2^x=1

=>2^x=2^0

=>x=0

c: 2^x=16

=>2^x=2^4

=>x=4

d; 3^x=9

=>3^x=3^2

=>x=2

e: 5^x=125

=>5^x=5^3

=>x=3

f: 8^x=64

=>8^x=8^2

=>x=2

f: 3^x+1=3^2

=>x+1=2

=>x=1