Đáp án:
5) $x=\dfrac{2}{3}$
6) $x=\dfrac{6}{5}$
Giải thích các bước giải:
5) $2\dfrac{2}{3}:x=1\dfrac{1}{5}:0,3$
$\dfrac{8}{3}:x=\dfrac{6}{5}:\dfrac{3}{10}$
$\dfrac{8}{3}:x=4$
$x=\dfrac{8}{3}:4$
$x=\dfrac{2}{3}$
Vậy $x=\dfrac{2}{3}$
6) $1,25:0,8=\dfrac{3}{8}:0,2x$
$\dfrac{5}{4}:\dfrac{4}{5}=\dfrac{3}{8}:\dfrac{1}{5}x$
$\dfrac{25}{16}=\dfrac{3}{8}:\dfrac{1}{5}x$
$\dfrac{1}{5}x=\dfrac{3}{8}:\dfrac{25}{16}$
$\dfrac{1}{5}x=\dfrac{6}{25}$
$x=\dfrac{6}{25}:\dfrac{1}{5}$
$x=\dfrac{6}{5}$
Vậy $x=\dfrac{6}{5}$
