Question

Tìm x, biết: a) x-5/8=1/4. b) 4/7:x=-5/14=> dấu âm ở giữ phân số 5/14

Answer 1

a) \(x-\dfrac{5}{8}=\dfrac{1}{4}\)

\(\Rightarrow x=\dfrac{1}{4}+\dfrac{5}{8}\)

\(\Rightarrow x=\dfrac{2}{8}+\dfrac{5}{8}=\dfrac{7}{8}\)

b) \(\dfrac{4}{7}:x=-\dfrac{5}{14}\)

\(\Rightarrow x=\dfrac{4}{7}:-\dfrac{5}{14}\)

\(\Rightarrow x=-\dfrac{8}{5}\)

Answer 2

a) \(x-\dfrac{5}{8}=\dfrac{1}{4}\)

\(x=\dfrac{1}{4}+\dfrac{5}{8}=\dfrac{2}{8}+\dfrac{5}{8}\)

\(x=\dfrac{7}{8}\)

b) \(\dfrac{4}{7}:x=-\dfrac{5}{14}\)

\(x=\dfrac{4}{7}:\left(-\dfrac{5}{14}\right)=\dfrac{4}{7}.\left(-\dfrac{14}{5}\right)\)

\(x=-\dfrac{8}{5}\)

Answer 3

a] x-5/8=1/4

    x       = 1/4 + 5/8

    X       = 7/8

B] 4/7:x= -5/14

          x= 4/7 : -5/14

          x= -8/5