Вычислите:[latex] \frac{0,07}{0,21} + \frac{0,4}{0,06} + \frac{0,9}{0,05} [/latex]

[latex]\frac{0,07}{0,21}+\frac{0,4}{0,06}+\frac{0,9}{0,05}=[/latex] [latex]=\frac{7*10^{-2}}{21*10^{-2}}+\frac{40*10^{-2}}{6*10^{-2}}+\frac{90*10^{-2}}{5*10^{-2}} =\frac{7}{21}+\frac{40}{6}+\frac{90}{5} =\frac{1*7}{3*7}+\frac{2*20}{2*3}+\frac{5*18}{5*1}=[/latex] [latex]=\frac{1}{3}+\frac{20}{3}+\frac{18}{1} =\frac{1+20}{3}+18= \frac{21}{3}+18= \frac{7*3}{1*3} +18= \frac{7}{1} +18=[/latex] [latex]=7+18=25[/latex]