\(\frac{6x}{12}+\frac{4x}{12}+\frac{3x}{12}=1\)
\(\frac{13x}{12}=1\)
x=1:13/12=12/13
Vậy x=12/13
\(\frac{x}{2}+\frac{x}{3}+\frac{x}{4}=1\)
\(\frac{6x}{12}+\frac{4x}{12}+\frac{3x}{12}=\frac{12}{12}\)
\(6x+4x+3x=12\)
\(x\left(6+4+3\right)=12\)
\(13x=12\)
\(x=12:13\)
\(x=\frac{12}{13}\)
x/2 + x/3 +x/4 =1
x.(1/2 + 1/3 + 1/4)=1
x. 13/12 =1
x =1:13/12
x =12/13