Question

Tìm x biết

a) 4/5 + x = 2/3

b)3/4 - x = 1/3

c) x - 5/9 = -2/3

d)(4,5 - 2x) : 3/4= 1 1/3

Answer 1

a) Ta có: \(\frac{4}{5}+x=\frac{2}{3}\)

hay \(x=\frac{2}{3}-\frac{4}{5}=\frac{10}{15}-\frac{12}{15}=\frac{-2}{15}\)

Vậy: \(x=\frac{-2}{15}\)

b) Ta có: \(\frac{3}{4}-x=\frac{1}{3}\)

hay \(x=\frac{3}{4}-\frac{1}{3}=\frac{9}{12}-\frac{4}{12}=\frac{5}{12}\)

Vậy: \(x=\frac{5}{12}\)

c) Ta có: \(x-\frac{5}{9}=\frac{-2}{3}\)

hay \(x=\frac{-2}{3}+\frac{5}{9}=\frac{-6}{9}+\frac{5}{9}=-\frac{1}{9}\)

Vậy: \(x=\frac{-1}{9}\)

d) Ta có: \(\frac{\left(4,5-2x\right)}{\frac{3}{4}}=1\frac{1}{3}\)

\(\Leftrightarrow\frac{9}{2}-2x=\frac{4}{3}\cdot\frac{3}{4}=1\)

\(\Leftrightarrow2x=\frac{9}{2}-1=\frac{7}{2}\)

hay \(x=\frac{7}{4}\)

Vậy: \(x=\frac{7}{4}\)

Answer 2

i don't know