Tìm x, biết -3/5.x=1/4+0,75 c) (1/7−1/3).x=28/3.(1/4−1/7) d) 5/7.x=9/8−0,125 e)(2/11+1/3).x=(1/7−1/8).5/6

a,  $\frac{-3}{5}$x = $\frac{1}{4}$ + 0,75  

⇔$\frac{-3}{5}$x = $\frac{1}{4}$ + $\frac{3}{4}$ 

⇔$\frac{-3}{5}$x = 1

⇔x = 1: $\frac{-3}{5}$ 

⇔x = $\frac{-5}{3}$ 

KL: x = $\frac{-5}{3}$ 

c, ($\frac{1}{7}$ – $\frac{1}{2}$)x = $\frac{28}{3}$( $\frac{1}{4}$ – $\frac{1}{7}$ 

⇔$\frac{-4}{21}$x = $\frac{28}{3}$. $\frac{3}{28}$

⇔$\frac{-4}{21}$x = 1

⇔x = 1 : $\frac{-4}{21}$ 

⇔x = $\frac{-21}{4}$ 

KL: ….

d, $\frac{5}{7}$x = $\frac{9}{8}$ – 0,125

⇔$\frac{5}{7}$x = $\frac{9}{8}$ – $\frac{1}{8}$ 

⇔$\frac{5}{7}$x = 1 

⇔x = $\frac{7}{5}$ 

KL: ….

e, ($\frac{2}{11}$ + $\frac{1}{3}$)x = ( $\frac{1}{7}$ – $\frac{1}{8}$) $\frac{5}{6}$ 

⇔$\frac{17}{33}$x = $\frac{5}{336}$

⇔x = $\frac{55}{1904}$ 

KL: ….