Question

сумма 2/0,9 + 5/1,8 скольки равна ?

Answer 1

$frac{2}{0.9} + frac{5}{1.8} = frac{2*2}{0.9*2} + frac{5}{1.8} = frac{4}{1.8}+ frac{5}{1.8} = frac{4+5}{1.8} = frac{9}{1.8} = frac{90}{18} =5$