Срочнооо номер 47 а)..... Это пропорция, нужно найти х

[latex]1)15,2*0,25=15 \frac{2}{10}* \frac{25}{100} =15 \frac{1}{5}* \frac{1}{4} = \frac{76}{5}* \frac{1}{4}= \frac{19}{5} [/latex] [latex]2)48,51:14,7=48 \frac{51}{100} :14 \frac{7}{10}= \frac{4851}{100} * \frac{10}{147} = \frac{33}{10} [/latex] [latex]3) \frac{19}{5} - \frac{33}{10}= \frac{38-33}{10} = \frac{5}{10}= \frac{1}{5} [/latex] [latex]4) \frac{1}{5} :x= \frac{1}{5x} [/latex] [latex]5) \frac{5}{66} :2 \frac{1}{2}= \frac{5}{66}* \frac{2}{5}= \frac{1}{33} [/latex] [latex]6) \frac{13}{44} - \frac{2}{11} = \frac{13-8}{44}= \frac{5}{44} [/latex] [latex]7) \frac{5}{44} - \frac{1}{33}= \frac{165-44}{1452} = \frac{121}{1452} = \frac{1}{12} [/latex] [latex]8) \frac{1}{12} *1 \frac{1}{5} = \frac{1}{12}* \frac{6}{5} = \frac{1}{10} [/latex] [latex]9)3,2+0,8=3 \frac{1}{5}+ \frac{4}{5}= \frac{16}{5}+ \frac{4}{5}= \frac{20}{5}=4 [/latex] [latex]10)5,5-3 \frac{1}{4} = \frac{11}{2} - \frac{13}{4} = \frac{22-13}{4}= \frac{9}{4} [/latex] [latex]11)4* \frac{9}{4} =9[/latex] [latex]5x=9: \frac{1}{10} [/latex] [latex]5x=90[/latex] [latex]x=18[/latex]