Anh gì ơi anh viết xấu em ko nhìn thấy

\(x+\frac{20}{100}+x=7,2\)

\(< =>2x=7,2-\frac{20}{100}=7,2-0,2\)

\(< =>2x=7< =>x=\frac{7}{2}=3,5\)

x+20%*x=7,2

=> x.100%-20%.x=7,2

=>x.(100%-20%)=7,2

=>x.80%  =7,2

=> x=7,2:80%

=> x=9

x + 20%.x = 72 

<=> 120% .x = 7,2

x = 7,2 : 120 . 100 = 6

\(x\div6\times7,2+1,3\times x+x\div2+15=19,95\)

\(\Leftrightarrow x\times\frac{1}{6}\times7,2+1,3\times x+x\times\frac{1}{2}=19,95-15\)

\(\Leftrightarrow x\times1,2+x\times1,3+x\times\frac{1}{2}=4,95\)

\(\Leftrightarrow x\times\left(1,2+1,3+\frac{1}{2}\right)=4,95\)

\(\Leftrightarrow x\times3=4,95\)

\(\Leftrightarrow x=4,95\div3\)

\(\Leftrightarrow x=1,65\)

Vậy x = 1,65

y x (7,2 - 6,2 )

y x 1

y = 1

y=1

 h minh nhe minh se h lai

x-20%*x=7.2 

=>  x .100 % - 20%.x = 7.2

=> x .(100% -20% ) = 7.2

=> x . 80% = 7.2

=> x = 7.2 : 80 % 

=> x = 9

\(x-20\%\times x=7,2\)

\(x-\frac{1}{5}\times x=7,2\)

\(x\times\left(1-\frac{1}{5}\right)=7,2\)

\(x\times\frac{4}{5}=7,2\)

\(x=7,2:\frac{4}{5}\)

\(x=9\)

X + 0,2 x X = 7,2

1,2 x X = 7,2

X = 7,2 : 1,2

X = 6

Đúng 100%

Đúng 100%

Đúng 100%

Ta có: \(x+20\%x=7,2\)

<=>\(x+0,2x=7,2\)

<=>\(x\left(1+0,2\right)=7,2\)

<=>\(1,2x=7,2\)

<=>\(x=7,2:1,2\)

<=>\(x=6\)

Vậy:\(x=6\)