Question

[Kim Ngân Nguyễn]

Tìm x:

a. x + 3/7 = 2/5 : 18/35

b. x nhân 5/9 = 4/5 - 1/3

Giải thích rõ ràng giúp mik nhé😢

Answer 1

[Lysr]

Answer 2

[Tryechun🥶]

\(a.x+\dfrac{3}{7}=\dfrac{2}{5}:\dfrac{18}{35}\\x+\dfrac{3}{7}=\dfrac{2}{5}\times\dfrac{35}{18} \\ x+\dfrac{3}{7}=\dfrac{7}{9}\\ x=\dfrac{7}{9}-\dfrac{3}{7}\\ x=\dfrac{22}{63}\)

\(b.x\times\dfrac{5}{9}=\dfrac{4}{5}-\dfrac{1}{3}\\x\times\dfrac{5}{9}=\dfrac{7}{15}\\ x=\dfrac{7}{15}:\dfrac{5}{9}\\ x= \dfrac{21}{25}\)