= 1/6 + 4/6 + 2/5

= 5/6 + 2/5

= 25/30 + 12/30

= 37/30

1/6 + 2/3 + 2/5

=    15/18 + 2/5

=          111/90

quy đồng nữa các bạn ơi

\(x-\frac{6}{5}\div\frac{2}{3}=\frac{5}{6}\)

\(\Leftrightarrow x-\frac{18}{10}=\frac{5}{6}\)

\(\Leftrightarrow x=\frac{5}{6}+\frac{18}{10}\)

\(\Leftrightarrow x=\frac{25}{30}+\frac{54}{30}\)

\(\Leftrightarrow x=\frac{79}{30}\)

\(x-\frac{6}{5}\div\frac{2}{3}=\frac{5}{6}\)

\(x-\frac{18}{10}=\frac{5}{6}\)

\(x=\frac{5}{6}+\frac{18}{10}\)

\(\Rightarrow x=\frac{79}{30}\)

`x-10/3=7/18+3/5`

`=> x-10/3=89/90`

`=> x=89/90+10/3`

`=> x=389/90`

thanhk you:)

Ta có:       x:7/8+3/4=7/4

                -> x:7/8=7/4-3/4

                ->x:7/8=1

                ->x=1*7/8

                ->x=7/8

                  Vậy x=7/8

\(x\div\frac{7}{8}+\frac{3}{4}=\frac{7}{4}\)

\(\Rightarrow x\div\frac{7}{8}=\frac{7}{4}-\frac{3}{4}\)

\(\Rightarrow x\div\frac{7}{8}=1\)

\(\Rightarrow x=1\times\frac{7}{8}\)

\(\Rightarrow x=\frac{7}{8}\)

\(\frac{x:7}{8}+\frac{3}{4}=\frac{7}{4}\)

\(\frac{x:7}{8}+\frac{6}{8}=\frac{14}{8}\)

\(\Rightarrow x:7+6=14\)

\(x:7=14-6\)

\(x:7=8\)

\(x=8\cdot7\Rightarrow x=56\)

\(x+\frac{3}{7}\times\frac{21}{9}=5\)

\(\Rightarrow x+\frac{3}{7}\times\frac{7}{3}=5\)

\(\Rightarrow x+1=5\)

\(\Rightarrow x=5-1=4\)

\(X+1=5\)

\(X=5-1\)

\(X=4\)

VẬY X=4 

K NHÁ BN

X+\(\frac{3}{7}\)x\(\frac{21}{9}\)=5

X+1=5

X=4

Vay X=.. 

lan sau viet p/s ban nhin o thanh cong cu co cai chu z lon nguoc day bam vao roi chon

\(\dfrac{1}{2}-\dfrac{1}{2}\left(3-2x\right)=0\)

\(\Rightarrow\dfrac{1}{2}\left[1-\left(3-2x\right)\right]=0\)

\(\Rightarrow\dfrac{1}{2}\left[1-3+2x\right]=0\)

\(\Rightarrow\dfrac{1}{2}\left[2x-2\right]=0\)

\(\Rightarrow2x-2=0\Rightarrow2x=2\Rightarrow x=1\)

x = 1 nha Nhật