Математика: Сделайте только 738,739 остальные не надо

Пошаговое объяснение:738.739....

Сделайте только 738,739 остальные не надо

Ответы

prisnik1252 11.10.2020 17:59

Пошаговое объяснение:

738.

$1)4\frac{1}{9} *0,9=\frac{37}{9} *\frac{9}{10} =\frac{37}{10} =3,7$

$2)27,2*\frac{2}{17} =\frac{272}{10}*\frac{2}{17} =\frac{16}{5} =3\frac{1}{5} =3,2$

$3)2\frac{1}{3} *1,2=\frac{7}{3} *\frac{12}{10} =\frac{28}{10} =2,8$

$4)0,6:\frac{9}{25} =\frac{6}{10} *\frac{25}{9} =\frac{10}{6} =\frac{5}{3} =1\frac{2}{3}$

$5)\frac{8}{21}:0.5=\frac{8}{21} *\frac{10}{5} =\frac{80}{105} =\frac{16}{21}$

$6)3.5:4\frac{2}{3} =\frac{35}{10} :\frac{14}{3} =\frac{35}{10} *\frac{3}{14} =\frac{15}{20} =\frac{3}{4} =0.75$

739.

$1)11.9-1\frac{4}{5} *1\frac{1}{3} =9.5\\\\1.1\frac{4}{5} *1\frac{1}{3} =\frac{9}{5} *\frac{4}{3} =\frac{12}{5} =2\frac{2}{5} =2.4\\\\2.11.9-2.4=9.5$

$2)16\frac{1}{2} :11+9\frac{1}{6} =10\frac{2}{3} \\\\1.16\frac{1}{2} :11=\frac{33}{2} *\frac{1}{11} =\frac{3}{2} =1.5\\\\2.1.5+9\frac{1}{6} =\frac{9}{6} +\frac{55}{6} =\frac{64}{6} =\frac{32}{3}=10\frac{2}{3}$

$3)(33.2-80\frac{1}{6} )*\frac{3}{13} =-10\frac{109}{130} \\\\1.33.2-80\frac{1}{6} =\frac{332}{10} -\frac{481}{6} =\frac{996}{30} -\frac{2405}{30} =-\frac{1409}{30} \\\\2.-\frac{1409}{30} *\frac{3}{13} =-\frac{1409}{130} =-10\frac{109}{130}$

$4)(0.28+1\frac{1}{3}) :\frac{11}{30} =4.4\\\\1.0.28+1\frac{1}{3} =\frac{28}{100} +\frac{4}{3} =\frac{84}{300}+\frac{400}{300} =\frac{484}{300} \\\\ 2.\frac{484}{300} :\frac{11}{30} =\frac{484}{300} *\frac{30}{11} =\frac{44}{10} =4.4$