\(\dfrac{x-1}{2}=\dfrac{y-2}{3}=\dfrac{z-3}{4}vax-2y+3z=14\)

\(\dfrac{x^2}{9}=\dfrac{y^2}{16}vax^2+y^2=100\)

\(\dfrac{2a}{3}=\dfrac{3b}{4}=\dfrac{4c}{5}va\alpha+b+c=49\)

\(\dfrac{a}{10}=\dfrac{b}{6}=\dfrac{c}{21}vaf5a+b-2c=28\)

\(\dfrac{a}{3}=\dfrac{b}{8}=\dfrac{c}{5}và2a+3b-c=50\)

Tìm x: \(\left|x-\dfrac{1}{3}\right|=|2-3x|\)

\(|97\dfrac{2}{3}-125\dfrac{3}{5}|+97\dfrac{2}{5}-125\dfrac{1}{3}\)

\(\left(\dfrac{-5}{8}\right)-x\div3\dfrac{5}{6}+7\dfrac{3}{4}=-2\)

\(2^{-1}+\left(5^2\right)^3\cdot5^{-6}+32-2\cdot\left(-3\right)^2\cdot\dfrac{1}{9}\)