Question

a             x nhân 5/7 bằng 1/4 cộng 1/5                                     2 3/3 chia x bằng 2/5 trừ 1/3

 

Answer 1

a) \(x\times\frac{5}{7}=\frac{1}{4}+\frac{1}{5}\)

\(x\times\frac{5}{7}=\frac{9}{20}\)

\(x=\frac{9}{20}\div\frac{5}{7}\)

\(x=\frac{63}{100}\)

a₍₂₎ : \(2\frac{3}{3}\div x=\frac{2}{5}-\frac{1}{3}\)

\(\frac{9}{3}\div x=\frac{1}{15}\)

\(x=\frac{9}{3}\div\frac{1}{15}\)

\(x=45\)