a) \(2.\left(x+\frac{2}{5}\right)+1\frac{1}{4}=\frac{11}{20}\)

\(2.\left(x+\frac{2}{5}\right)+\frac{5}{4}=\frac{11}{20}\)

\(2.\left(x+\frac{2}{5}\right)=\frac{-7}{10}\)

\(x+\frac{2}{5}=\frac{-7}{20}\)

\(x=\frac{-13}{20}\)

Vậy \(x=\frac{-13}{20}\)

b)\(x-1\frac{1}{8}-\frac{2}{3}x-\frac{5}{6}x=75\%\)

  \(\left(x-\frac{2}{3}x-\frac{5}{6}x\right)-\frac{9}{8}=\frac{3}{4}\)

\(\frac{-1}{2}x-\frac{9}{8}=\frac{3}{4}\)

\(\frac{-1}{2}x=\frac{15}{8}\)

\(x=\frac{-15}{4}\)

Vậy \(x=\frac{-15}{4}\)

\(a,2.\left(x+\frac{2}{5}\right)+1\frac{1}{4}=\frac{11}{20}\)

\(2.\left(x+\frac{2}{5}\right)+\frac{5}{4}=\frac{11}{20}\)

\(2.\left(x+\frac{2}{5}\right)=\frac{11}{20}-\frac{5}{4}\)

\(2.\left(x+\frac{2}{5}\right)=\frac{-7}{10}\)

\(x+\frac{2}{5}=\frac{-7}{10}:2\)

\(x+\frac{2}{5}=\frac{-7}{20}\)

\(x=\frac{-7}{20}-\frac{2}{5}\)

\(x=\frac{-3}{4}\)

Chị gái xinh đẹp à. Câu hỏi của chị khó quá ko ai trả lời. Thôi thì.......k cho mem đi😉

\(x+11\)\(⋮\)\(x+2\)

<=>   \(x+2+9\)\(⋮\)\(x+2\)

mà  \(x+2\)\(⋮\)\(x+2\)

=>  \(9\)\(⋮\)\(x+2\)

hay  \(x+2\)\(\inƯ\left(9\right)\)

đến đây tự lm tiếp

a) \(\left(x-3\right)^2-4=0\)

\(\left(x-7\right)\left(x+1\right)=0\)

\(\orbr{\begin{cases}x=7\\x=-1\end{cases}}\)

b) \(x^2-2x=24\)

\(x^2-2x-24=0\)

\(\left(x-6\right)\left(x+4\right)=0\)

\(\orbr{\begin{cases}x=6\\x=-4\end{cases}}\)

c) \(\left(2x-1\right)^2+\left(x+3\right)^2-5\left(x+7\right)\left(x-7\right)=0\)

\(4x^2+4x+1+x^2+6x+9-5\left(x^2-49\right)=0\)

\(5x^2+10x+10-5x^2+245=0\)

\(10x+255=0\)

\(x=-25.5\)

A) \(\left(x-3\right)^2-4=0\)

\(\left(x-3\right)^2=4\Rightarrow\left(x-3\right)^2=\left(-2\right)^2;2^2\)

th1\(\left(x-3\right)^2=2^2\)

\(\Rightarrow x-3=2\)

\(\Rightarrow x=2+3\)

\(\Rightarrow x=5\)

th2: \(\left(x-3\right)^2=\left(-2\right)^2\)

\(\Rightarrow x-3=-2\)

\(\Rightarrow x=-2+3\)

\(\Rightarrow x=1\)

\(\Leftrightarrow x\in\left\{1;5\right\}\)

a) \(\left(x-3\right)^2-4=0\)

Ta xét 2TH:

TH1: \(x-3=2\)

\(x-3+3=2+3\)

\(x=5\)

TH2: \(x-3=-2\)

\(x-3+3=-2+3\)

\(x=1\)

=> \(x\in\left\{1;5\right\}\)

a, x - 2/5 = -3/4

=> x = -7/20

vậy_

b, 7x - 3/4 = 25%

=> 7x = 25% + 75%

=> 7x = 1

=> x = 1/7

a) \(\left(\frac{1}{3}+\frac{1}{5}\right)\times x=\frac{8}{25}\)

                 \(\frac{8}{15}\times x=\frac{8}{25}\)

                             \(x=\frac{8}{25}:\frac{8}{15}\)

                              \(x=\frac{3}{5}\)

Vậy x = 3/5

b) \(\frac{1}{2}:\frac{4}{5}:x=\frac{7}{3}\)

             \(\frac{5}{8}:x=\frac{7}{3}\)

                   \(x=\frac{5}{8}:\frac{7}{3}\)

                   \(x=\frac{15}{56}\)

Vậy x = 15/36

ủng hộ tớ nha. thank you nhìu

a) (1/3 + 1/5) . x = 8/25

     (5/15 + 3/15) . x = 8/25

=>   8/15 . x             = 8/25

                x             = 8/25 : 8/15

                x              = 3/5

Vậy x = 3/5

uh. nhớ nhé

a) (\(\frac{1}{3}\)+ \(\frac{1}{5}\)) x X=\(\frac{8}{25}\)

\(\frac{8}{15}\)x X = \(\frac{8}{25}\)

X= \(\frac{8}{25}\): \(\frac{8}{15}\)

X= \(\frac{3}{5}\)

b)\(\frac{1}{2}\):\(\frac{4}{5}\)x X  = \(\frac{7}{3}\)

\(\frac{5}{8}\)x X = \(\frac{7}{3}\)

X= \(\frac{7}{3}\): \(\frac{5}{8}\)

x= \(\frac{56}{15}\)

k mình nha bạn

a) \(x=\frac{7}{25}+\frac{-1}{5}\)

\(\Rightarrow x=\frac{2}{25}\)

Vậy \(x=\frac{2}{25}\)

b) \(x=\frac{5}{11}+\frac{4}{-9}\)

\(\Rightarrow x=\frac{1}{99}\)

Vậy \(x=\frac{1}{99}\)

c) \(\frac{5}{9}+x=\frac{-1}{3}\)

\(\Rightarrow x=\frac{-1}{3}-\frac{5}{9}\)

\(\Rightarrow x=\frac{-8}{9}\)

Vậy \(x=\frac{-8}{9}\)

d) \(\frac{3}{4}-x=-1\)

\(\Rightarrow x=\frac{3}{4}-\left(-1\right)\)

\(\Rightarrow x=\frac{7}{4}\)

Vậy \(x=\frac{7}{4}\)

e) \(x+4=\frac{1}{5}\)

\(\Rightarrow x=\frac{1}{5}-4\)

\(\Rightarrow x=\frac{-19}{5}\)

Vậy \(x=\frac{-19}{5}\)

f) \(x-\frac{1}{5}=2\)

\(\Rightarrow x=2+\frac{1}{5}\)

\(\Rightarrow x=\frac{11}{5}\)

Vậy \(x=\frac{11}{5}\)

g) \(x+\frac{5}{3}=\frac{1}{81}\)

\(\Rightarrow x=\frac{1}{81}-\frac{5}{3}\)

\(\Rightarrow x=\frac{-134}{81}\)

Vậy \(x=\frac{-134}{81}\)

_Chúc bạn học tốt_

dễ thế mà ko lm đc, viết ra từng câu đi, dài quá ai làm nổi

LÀM XONG RÒI 

cậu muốn gì hả Kurama

25.35.4

=25.4.35

=100.35

=3500

5.15.2

=5.2.15

=10.15

=150

x-9=0

    x=0+9

    x=9

x+10=10

      x=10-10

      x=0

25. 35 . 4 = ( 25 . 4 )  .35 = 100 . 35 = 3500

5 . 15 . 2 = ( 5 . 2 ) . 15 = 10 . 15= 150

Bài 2 : 

x - 9 = 0 => x = 0 + 9  => x = 9. Vậy x = 9

x + 10 = 10 => x = 10 - 10 => x = 0. Vậy x = 0