Question

Tìm X biết:

a/ -2/3 : x + 5/8=-7/12

b/ -1/2+1/2 x X = -2/3 -3

Answer 1

a) \(-\dfrac{2}{3}:x+\dfrac{5}{8}=-\dfrac{7}{12}\)

\(\Rightarrow\dfrac{-2}{3}:x=-\dfrac{7}{12}-\dfrac{5}{8}\)

\(\Rightarrow\dfrac{-2}{3}:x=-\dfrac{29}{24}\)

\(\Rightarrow x=-\dfrac{2}{3}:\left(-\dfrac{29}{24}\right)\)

\(\Rightarrow x=-\dfrac{2}{3}.\left(-\dfrac{24}{29}\right)\)

\(\Rightarrow x=\dfrac{16}{29}\)

b) \(-\dfrac{1}{2}+\dfrac{1}{2}x=-\dfrac{2}{3}-3\)

\(\Rightarrow-\dfrac{1}{2}+\dfrac{1}{2}x=-\dfrac{11}{3}\)

\(\Rightarrow\dfrac{1}{2}x=-\dfrac{11}{3}+\dfrac{1}{2}\)

\(\Rightarrow\dfrac{1}{2}x=-\dfrac{19}{6}\)

\(\Rightarrow x=-\dfrac{19}{6}:\dfrac{1}{2}\)

\(\Rightarrow x=-\dfrac{19}{6}.2\)

\(\Rightarrow x=-\dfrac{19}{3}\)