a. $\frac{x}{5}=\frac{-2}{1,25}$ Ta có: $x.1,25=5.(-2)$ $x=\frac{5.(-2)}{1,25}$ $x = - 8$ | b. $18:x = 2,4:3,6$ =>$\frac{18}{x}=\frac{2,4}{3,6}$ Ta có: $18.36=x.2,4$ $x=\frac{18.3,6}{2,4}$ $x = 2$ | c. $(x+1):0,4=0,5:0,2$ => $\frac{x + 1}{0,4}=\frac{0,5}{0,2}$ Ta có: $(x + 1) . 0,2 = 0,4 . 0,5$ $x + 1=\frac{0,4.0,5}{0,2}$ $x + 1 = 1$ $x = 1 - 1 = 0$ |
