Question

Tìm x:

a) 23/15 - 2/3 * x = 0,2

b) x/3 = 2/3 + -1/7

Answer 1

\(a,\frac{23}{15}-\frac{2}{3}x=0,2\)

\(\frac{2}{3}x=\frac{4}{3}\)

\(x=2\)

\(b,\frac{x}{3}=\frac{2}{3}+\left(\frac{-1}{7}\right)\)

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

\(\Rightarrow x.21=3.11\)

\(\Rightarrow21x=33\)

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

Answer 2

a.  \(\frac{23}{15}-\frac{2}{3}x=0,2\)

\(\frac{23}{15}-\frac{2}{3}x=\frac{1}{5}\)

\(\frac{2}{3}x=\frac{23}{15}-\frac{1}{5}\)

\(\frac{2}{3}x=\frac{4}{3}\)

\(x=\frac{4}{3}:\frac{2}{3}\)

\(x=2\)

Vậy  \(x=2\)

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

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

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

\(\Rightarrow7x=11\)

\(x=11:7\)

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

Vậy\(x=\frac{11}{7}\)