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

<=> x-7/20=1

<=> x= 27/20

a, \(\left(3x+\frac{1}{4}\right)-\frac{1}{3}\left(6x+\frac{9}{5}\right)=1\)

\(3x+\frac{1}{4}-\frac{6}{3}x-\frac{3}{5}=1\)

\(x-\frac{7}{20}=1\Leftrightarrow x=\frac{27}{20}\)

b,ĐKXĐ : x \(\ne\)-1/2 ; 1/2 

 \(\left(\frac{5}{2x+1}\right)-\left(\frac{2x}{1-2x}\right)=1-\left(\frac{6-4x}{4x^2-1}\right)\)

\(\frac{5}{2x+1}-\frac{2x}{1-2x}=1-\frac{6-4x}{4x^2-1}\)

\(\frac{5}{2x+1}-\frac{2x}{1-2x}=1-\frac{2\left(3-2x\right)}{\left(2x+1\right)\left(2x-1\right)}\)

\(\frac{5\left(1-2x\right)\left(2x-1\right)\left(2x+1\right)}{\left(2x+1\right)^2\left(1-2x\right)\left(2x-1\right)}-\frac{2x\left(2x+1\right)^2\left(2x-1\right)}{\left(1-2x\right)\left(2x+1\right)^2\left(2x-1\right)}=\frac{\left(2x+1\right)^2\left(1-2x\right)\left(2x-1\right)}{\left(2x+1\right)^2\left(1-2x\right)\left(2x-1\right)}-\frac{2\left(3-2x\right)\left(2x+1\right)\left(1-2x\right)}{\left(2x+1\right)\left(2x-1\right)^2\left(2x-1\right)\left(1-2x\right)}\)

\(22x-5-20x^2-8x^3=18x-7-8x^3-4x^2\)

lm nốt nha,bị troll rồi ko vt đc nữa.

6:

a:

Xét tứ giác AEDF có

góc AED=góc AFD=góc FAE=90 độ

=>AEDF là hình chữ nhật

Xet ΔDEB vuông tạiE và ΔCFD vuông tại F có

DE=CF

EB=FD

=>ΔDEB=ΔCFD

b: Xet ΔAED vuông tại E và ΔDFA vuông tại F có

AE=DF

ED=FA

=>ΔAED=ΔDFA

\(\left(0,5\times m-0,75\right):4=2,5\)

\(0,5\times m-0,75=2,5\times4\)

\(0,5\times m-0,75=10\)

\(0,5\times m=10+0,75\)

\(0,5\times m=10,75\)

\(m=10,75:0,5\)

\(m=21,5\)

`@` `\text {Ans}`

`\downarrow`

`(0,5 \times m - 0,75) \div 4 = 2,5`

`=> 0,5 \times m - 0,75 = 2,5 \times 4`

`=> 0,5 \times m - 0,75 = 10`

`=> 0,5 \times m = 10 + 0,75`

`=> 0,5 \times m = 10,75`

`=> m = 10,75 \div 0,5`

`=> m =21,5`

Vậy, `m=21,5`.

=11/2(-1/5+3/7-4/5+4/7)

=11/2(1-1)

=0

\(\left(\dfrac{-1}{5}+\dfrac{3}{7}\right):\dfrac{2}{11}+\left(\dfrac{-4}{5}+\dfrac{4}{7}\right):\dfrac{2}{11}\) 

\(=\dfrac{8}{35}:\dfrac{2}{11}+\dfrac{-8}{35}:\dfrac{2}{11}\) 

\(=\dfrac{2}{11}:\left(\dfrac{8}{35}+\dfrac{-8}{35}\right)\) 

\(=\dfrac{2}{11}:0=0\) 

nãy mik lm r bn xem lại nhé

`-2/5 : x=1/2`

`=> x= -2/5 : 1/2`

`=> x= -2/5 xx 2`

`=>x= -4/5`

__

`7/6 : x = 7/4`

`=>x= 7/6 : 7/4`

`=>x=7/6 xx 4/7`

`=>x= 28/42`

`=>x=2/3`

tìm x hả

\(x=\dfrac{-2}{5}:\dfrac{1}{2}\)

\(x=\dfrac{-4}{5}\)

b. \(x=\dfrac{7}{6}:\dfrac{7}{4}\)

\(x=\dfrac{2}{3}\)