Question

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

Answer 1

$1)15,2*0,25=15 frac{2}{10}* frac{25}{100} =15 frac{1}{5}* frac{1}{4} = frac{76}{5}* frac{1}{4}= frac{19}{5}$

$2)48,51:14,7=48 frac{51}{100} :14 frac{7}{10}= frac{4851}{100} * frac{10}{147} = frac{33}{10}$

$3) frac{19}{5} - frac{33}{10}= frac{38-33}{10} = frac{5}{10}= frac{1}{5}$

$4) frac{1}{5} :x= frac{1}{5x}$

$5) frac{5}{66} :2 frac{1}{2}= frac{5}{66}* frac{2}{5}= frac{1}{33}$

$6) frac{13}{44} - frac{2}{11} = frac{13-8}{44}= frac{5}{44}$

$7) frac{5}{44} - frac{1}{33}= frac{165-44}{1452} = frac{121}{1452} = frac{1}{12}$

$8) frac{1}{12} *1 frac{1}{5} = frac{1}{12}* frac{6}{5} = frac{1}{10}$

$9)3,2+0,8=3 frac{1}{5}+ frac{4}{5}= frac{16}{5}+ frac{4}{5}= frac{20}{5}=4$

$10)5,5-3 frac{1}{4} = frac{11}{2} - frac{13}{4} = frac{22-13}{4}= frac{9}{4}$

$11)4* frac{9}{4} =9$

$5x=9: frac{1}{10}$

$5x=90$

$x=18$