Đề bài

Tìm x, biết: a) \(\frac{{ - 5}}{8} + x = \frac{{ - 7}}{6};\) b) \(x - \frac{{ - 3}}{4} = \frac{{ - 14}}{{25}}\);

Lời giải chi tiết

a) \(\frac{{ - 5}}{8} + x = \frac{{ - 7}}{6}\)\(x = \frac{{ - 7}}{6} - \frac{{ - 5}}{8}\)\(x = \frac{{ - 28}}{{24}} + \frac{{15}}{{24}}\)\(x = \frac{{ - 13}}{{24}}\)Vậy \(x = \frac{{ - 13}}{{24}}\)b) \(x - \frac{{ - 3}}{4} = \frac{{ - 14}}{{25}}\)\(x+\frac{3}{4}=\frac{-14}{25}\)\(x= \frac{{ - 14}}{{25}}+\frac{{ - 3}}{{4}}\)\(x = \frac{{ - 56}}{100} + \frac{{ - 75}}{{100}}\)\(x = \frac{{ - 131}}{100}\)Vậy \(x = \frac{{ - 131}}{100}\)