Question

Bài 1 : Tìm X

a, 5/9 - 6/7 x ( 7/12x - 14/3) = 9/8

b, 1/5 : x + 8/7 = 1/5 + 3/14

c, 1/7 x - 5/14 ( x - 7/10 ) + 5/ 21

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Answer 1

Bài 1: 

a: \(\Leftrightarrow\dfrac{6}{7}\left(\dfrac{7}{12}x-\dfrac{14}{3}\right)=\dfrac{5}{9}-\dfrac{9}{8}=\dfrac{-41}{72}\)

\(\Leftrightarrow x\cdot\dfrac{7}{12}-\dfrac{14}{3}=-\dfrac{287}{432}\)

\(\Leftrightarrow x\cdot\dfrac{7}{12}=\dfrac{1729}{432}\)

hay \(x=\dfrac{247}{36}\)

b: \(\Leftrightarrow\dfrac{1}{5}:x=\dfrac{1}{5}+\dfrac{3}{14}-\dfrac{8}{7}=\dfrac{-51}{70}\)

hay \(x=-\dfrac{14}{51}\)

c: đề sai rồi bạn