25-x/56 = 6/16

=> 2.(25-x)/112=7.6/112

=> 2.(25-x)= 42

=> 50 - 2x = 42

=> -2x = 50 - 42

=> -2x = 8

=> x = 8:(-2)

=> x = 4

\(\frac{25-x}{56}=\frac{6}{16}\)

\(\frac{25-x}{56}=\frac{3}{8}\)

\(\frac{25-x}{56}=\frac{21}{56}\)

\(\Rightarrow25-x=21\)

\(\Rightarrow x=25-21\)

\(\Rightarrow x=4\)

Vậy x=4

=>(25-x)16=6x56=280

25-x=17.5

x=7.5=15/2

vậy x=15/2

ta giản ước : 6/16 = 3/8 như vậy, ta có :

\(\frac{25-x}{56}=\frac{3}{8}\)

quy đồng 2 phân số cho nhau : ( mẫu số chung ) = 56

ta có : 56 : 8 = 7

\(\frac{3x7}{8x7}=\frac{21}{56}\)

bây giờ, bài toán sẽ như sau :

\(\frac{25-x}{56}=\frac{21}{56}\)

vậy, x = 25 - 21 = 4

k mk nha

chúc bạn học giỏi

Theo đề ta có: \(\frac{25-x}{56}=\frac{6}{16}\)

Ta rút gọn: \(\frac{25-x}{56}=\frac{3}{8}\)

\(\Leftrightarrow\)25 -x . 8 = 56 . 3

\(\Rightarrow\)25 - x . 8 = 168​

\(\Rightarrow\)25 - x      = 168 : 8​

\(\Rightarrow\)25 - x      = 21

\(\Rightarrow\)     - x     = 21 - 25

\(\Rightarrow\)     - x     =  -4

\(\Rightarrow\)       x = 4

Vậy x = 4.

đây là toán lớp 6 nè

lớp 5 mà

\(\frac{25-x}{56}=\frac{6}{16}\)

\(\Rightarrow\frac{25-x}{56}=\frac{3}{8}\)

\(\Rightarrow\left(25-x\right).8=56.3\)

\(\Rightarrow25.8-8x=168\)

\(\Rightarrow200-8x=168\)

\(\Rightarrow8x=200-168\)

\(\Rightarrow8x=32\)

\(\Rightarrow x=32:8\)

\(\Rightarrow x=4\)

Tham khảo nha !!! 

Cách này dễ hơn nèk : 

\(\frac{25-x}{56}=\frac{6}{16}\)

\(\Leftrightarrow\)\(\frac{25-x}{56}=\frac{3}{8}\)

\(\Leftrightarrow\)\(\frac{25-x}{56}=\frac{21}{56}\)

\(\Leftrightarrow\)\(25-x=21\)

\(\Leftrightarrow\)\(x=25-21\)

\(\Leftrightarrow\)\(x=4\)

Vậy \(x=4\)

Chúc bạn học tốt ~ 

Nhân chéo là ra mà

56 x 6 = 25 - X x16

=56 x 6 : 16 = 21

25 - 21 = 4

Vậy X bằng 4

\(\left(x-2011\right)\left(\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+\frac{1}{42}+\frac{1}{56}+\frac{1}{72}\right)=\frac{16}{9}\)

\(\left(x-2011\right)\cdot\frac{2}{9}=\frac{16}{9}\)

\(x-2011=8\)

\(x=2019\)

\(\frac{x-2011}{12}+\frac{x-2011}{20}+\frac{x-2011}{30}+\frac{x-2011}{42}+\frac{x-2011}{56}+\frac{x-2011}{72}=\frac{16}{9}\)

\(\left(x-2011\right)\left(\frac{1}{12}+\frac{1}{20}+\frac{1}{30}+\frac{1}{42}+\frac{1}{56}+\frac{1}{72}\right)=\frac{16}{9}\)

\(\left(x-2011\right)\left(\frac{1}{3.4}+\frac{1}{4.5}+\frac{1}{5.6}+\frac{1}{6.7}+\frac{1}{7.8}+\frac{1}{8.9}\right)=\frac{16}{9}\)

\(\left(x-2011\right)\left(\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+...+\frac{1}{8}-\frac{1}{9}\right)=\frac{16}{9}\)

\(\left(x-2011\right)\left(\frac{1}{3}-\frac{1}{9}\right)=\frac{16}{9}\)

\(\left(x-2011\right)\frac{2}{9}=\frac{16}{9}\)

\(x-2011=8\Rightarrow x=2019\)

a) \(\left(\frac{1}{16}\right)^x=\left(\frac{1}{2}\right)^{10}\)

\(\left(\frac{1}{2}\right)^{4x}=\left(\frac{1}{2}\right)^{10}\)

\(\Rightarrow4x=10\)

x = 2,5

I x - 1/6 I - 6/16 = 25%

=> I x - 1/6 I- 6/16 = 1/4

=>I x - 1/6 I = 5/8

\(\Rightarrow\orbr{\begin{cases}x-\frac{1}{6}=\frac{5}{8}\\x-\frac{1}{6}=-\frac{5}{8}\end{cases}}\)

\(\Rightarrow\orbr{\begin{cases}x=\frac{19}{24}\\x=-\frac{11}{24}\end{cases}}\)

vậy x = 19/24 , x = -11/24

\(\left|x-\frac{1}{6}\right|-\frac{6}{16}=25\%\)

\(\left|x-\frac{1}{6}\right|-\frac{3}{8}=\frac{2}{8}\)

\(\left|x-\frac{1}{6}\right|=\frac{2}{8}+\frac{3}{8}\)

\(\left|x-\frac{1}{6}\right|=\frac{5}{8}\)

=> 2 trường hợp:

1 là \(x-\frac{1}{6}=\frac{5}{8}\)

2 là \(x-\frac{1}{6}=\frac{-5}{8}\)

Trường hợp 1:\(x=\frac{5}{8}+\frac{1}{6}=\frac{19}{24}\)

Trường hợp 2:\(x=\frac{-5}{8}+\frac{1}{6}=\frac{-11}{24}\)

Hội con 🐄 chúc bạn học tốt!!!

|x - 1/6| - 6/16 = 25%

|x - 1/6| - 3/8 = 0,25

|x - 1/6| = 0,25 + 3/8

|x - 1/6| = 5/8

x - 1/6 = 5/8 hoặc x - 1/6 = -5/8

x = 5/8 + 1/6         x = -5/8 + 1/6

x =19/24               x = -11/24