3/10 x x=2/5 

x = 2/5:3/10

x = 4/3

1/8 : x  = 1/2 

x = 1/8:1/2

x= 1/4

5/6 : 3/4  = 5/6x4/2= 10/9

1: 2/3= 1/1 x 3/2= 3/2

5/6 + 3/4  = 19/12

1 + 2/3= 1/1+2/3= 5/3

 5/6 - 3/4 = 1/12

1 - 2/3= 1/1-2/3= 1/3

5/6 x 3/4= 5/8

1/1x2/3= 2/3

a: \(\Leftrightarrow\left|x\cdot\dfrac{7}{3}-\dfrac{3}{4}\right|=1+\dfrac{1}{3}+\dfrac{2}{3}=2\)

\(\Leftrightarrow\left[{}\begin{matrix}x\cdot\dfrac{7}{3}-\dfrac{3}{4}=2\\x\cdot\dfrac{7}{3}-\dfrac{3}{4}=-2\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{33}{28}\\x=-\dfrac{15}{28}\end{matrix}\right.\)

b: \(\Leftrightarrow\left|x\cdot\dfrac{2}{3}-\dfrac{1}{3}\right|=\dfrac{6}{5}\)

\(\Leftrightarrow\left[{}\begin{matrix}x\cdot\dfrac{2}{3}-\dfrac{1}{3}=-\dfrac{6}{5}\\x\cdot\dfrac{2}{3}-\dfrac{1}{3}=\dfrac{6}{5}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{-13}{10}\\x=\dfrac{23}{10}\end{matrix}\right.\)

a: =5/6(1/8+2/3)=5/6*19/24=95/144

b: =3/4(7/5-1/2)=27/40

c: =35/24*2/3=35/36

a, 5/2 + 3/4 : x = -1/2

=> x = -1/4

b, 1/2 . x + 3/5 . x = -2/3

=> x = -20/33

c, 4/7 . x - x = -9/14

=> x = 3/2

A

\(\frac{3}{5}\div\frac{4}{5}+\frac{1}{2}\times\frac{2}{3}\)

\(=\frac{3}{4}+\frac{1}{3}\)

\(=\frac{13}{12}\)

B

\(\frac{5}{4}\times x=\frac{3}{8}+\frac{1}{4}\)

 \(\frac{5}{4}\times x =\frac{5}{8}\)

\(x=\frac{5}{8}\div\frac{5}{4}\)

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

a) (x+2y)²=x²+4xy+4y²

^b) (a-3b)²=a²- 6ab+9b²

bài 1 : điền vào chỗ chấm để đk khẳng định đúng :

a) (.x..+2y...)²=x²+..4y.+4y²

b) (.a..-.3b..)²=a²-6ab+.9b²..

c) (.m..+.\(\frac{1}{2}\)..)²=.m²..+m+1/4

d) 25a²-..\(\frac{1}{4}b\).=(.5a..+1/2b)(..5a..-1/2b)

e)(.2x...+.1..)^2 = 4x^2 +.4x..+1

g)(2-x)(.4..+.2x..+.x²..)=8-x^3

h) 16a^2 - ..9. = (..4a.+3)(..4a.-3)

f)25 - ..30y.+9y^2=(..5.+...3y.)^2

đây bạn

a) 1/7 - 3/5x = 3/5

3/5x= 1/7 - 3/5 

3/5x = -16/35

x= -16/35 : 3/5 = -16/21

b) 3/7 - 1/2x = 5/3

1/2x = 3/7 - 5/3 = -26/21

x= -26/21 : 1/2 = -52/21

 Thanh Nga làm nốt đc ko bn