\(x-\frac{3}{5}=1\div3\)

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

\(x=\frac{1}{3}+\frac{3}{5}=\frac{14}{15}\)

Chắc x 1/6 = 5 : 4 là phép nhân

\(x\times\frac{1}{6}=5\div4\)

\(x\times\frac{1}{6}=\frac{5}{4}\)

\(x=\frac{5}{4}\div\frac{1}{6}\)

\(x=\frac{15}{2}\)

x-3/5=1/3

x=1/3+3/5

x=14/15

x.1/6=5/4

x=5/4:1/6

x=5/4x6

x=15/2

x - \(\frac{3}{5}\)= 1 : 3 

x - \(\frac{3}{5}\)= \(\frac{1}{3}\)

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

x         = \(\frac{14}{15}\)

\(\frac{x-1}{2}=\frac{y-2}{3}=\frac{z-3}{4}\Rightarrow\frac{2x-2}{4}=\frac{3y-6}{6}=\frac{z-3}{4}\)

Áp dụng tính chất của dãy tỉ số bằng nhau ta có:

\(\frac{2x-2}{4}=\frac{3y-6}{6}=\frac{z-3}{4}=\frac{\left(2x-2\right)+\left(3y-6\right)-\left(z-3\right)}{4+6-4}=\frac{2x-2+3y-6-z+3}{4+6-4}\)

\(=\frac{\left(2x+3y-z\right)+\left(-2+6+3\right)}{6}=\frac{50+\left(-5\right)}{6}=\frac{45}{6}=7,5\)

\(\frac{x-1}{2}=7,5\Rightarrow x-1=15\Rightarrow x=16\)

\(\frac{y-2}{3}=7,5\Rightarrow y-2=24,5\Rightarrow y=20,5\)

\(\frac{z-3}{4}=7,5\Rightarrow z-3=30\Rightarrow z=33\)

Ta có:

x - y = x.y => x = x.y + y = y.(x + 1)

=> \(\frac{x}{y}=x+1=x-y\) = x + (-y)

=> -y = 1 hay y = -1

=> x = -1.(x + 1) = -x - 1

=> x + x = -1 = 2x

=> \(x=\frac{-1}{2}\)

Vậy \(x=\frac{-1}{2};y=-1\)

\(\Rightarrow\left(x+1\right)\times\left(x-1+1\right):2=1225\\ \Rightarrow\left(x+1\right)\times x=1225\times2=2450=49\times50\\ \Rightarrow x=49\)

Ta có: \(\frac{3x-y}{x+y}=\frac{3}{4}\)

\(\Rightarrow4\left(3x-y\right)=3\left(x+y\right)\)

\(\Rightarrow12x-y=3x+3y\)

\(\Rightarrow12x-3x=y+3y\)

\(\Rightarrow9x=4y\)

\(\Rightarrow\frac{x}{y}=\frac{4}{9}\)

\(\Rightarrow x=4;y=9\)

=>(-12x)-(-60)+21-7x=5

=>(-12x)+60+21-7x=5

=>(-12x-7x)=5-(60+21)=-76

=>(-19x)=-76=>x=4

Vậy x=4

-12(x-5)+7(3-x)=5

-12.x+12.5+7.3-7.x

-19x+60+21=5

-19x=-76

x=-76:(-19)=4

Vậy x=4

-12(x-5) + 7(3-x) =5 

( -12x + 60) + ( 21 - 7x) = 5

 -12x + 60 + 21 - 7x = 5

  -19x + 81 = 5

   -19x = 76

        x = -4