[tex]\dfrac{3,0}{0,7} \cdot \dfrac{7}{18} = \dfrac{3}{0,7} \cdot \dfrac{7}{18}= 3 \div 0,7 \cdot \dfrac{7}{18} = \dfrac{3}{1} \div \dfrac{7}{10} \cdot \dfrac{7}{18} = \dfrac{3}{1} \cdot \dfrac{10}{7} \cdot \dfrac{7}{18} =\dfrac{3\cdot 10}{18} =\dfrac{30}{18} =1\dfrac{12}{18} =1\dfrac{2}{3}[/tex]
