1,25/0,1x = 1,35/0,2

Lời giải:

\(\frac{{1,25}}{{0,1x}} = \frac{{1,35}}{{0,2}}\)

\(0,1x = \frac{{1,25\,\,.\,\,0,2}}{{1,35}}\)

\(0,1x = \frac{{0,25}}{{1,35}}\)

\(0,1x = \frac{5}{{27}}\)

\(x = \frac{5}{{27}}:0,1\)

\(x = \frac{{50}}{{27}}\)

Vậy \(x = \frac{{50}}{{27}}\).