Question

\(\frac{x}{3}=\frac{2}{3}+-\frac{1}{7}\)       Tìm x again

Help me please >~<

Answer 1

\(\frac{x}{3}=\frac{2}{3}+\frac{-1}{7}\)

\(\frac{x}{3}=\frac{11}{21}\)

\(x=\frac{11.3}{21}\)(Áp dụng công thức \(\frac{a}{b}=\frac{c}{d}\)khi \(a.d=b.c\))

\(\Rightarrow x=\frac{11}{7}\)

~Học tốt~

Answer 2

\(\frac{x}{3}=\frac{2}{3}+\frac{-1}{7}\)

\(\frac{x}{3}=\frac{2.7+\left(-1\right).3}{21}\)

\(\frac{x}{3}=\frac{11}{21}\)

\(\Leftrightarrow21x=33\)

\(\Leftrightarrow x=\frac{33}{21}=\frac{11}{7}\)