Пример помогите пжжжж

Решите задачу:

$1)3 \frac{7}{25} +2,72=3,28+2,72=6 \\ 2)6* \frac{5}{24} = \frac{5}{4} \\ 3) \frac{15}{16} :3 \frac{3}{4}= \frac{15}{16} * \frac{4}{15} = \frac{1}{4} \\ 4) \frac{1}{4}- \frac{2}{9} = \frac{9-8}{36} = \frac{1}{36} \\ 5) \frac{5}{4}: \frac{1}{36}= \frac{5}{4} * \frac{36}{1} =45 \\ 6) 0,224:0,35=0,64 \\ 7)0,36+0,64=1 \\8) 1*5=5 \\ 9)5,85:1 \frac{19}{20} =5,85:1,95=3 \\ 10)3-2 \frac{5}{9} = \frac{4}{9} \\ 11) \frac{4}{9} :4= \frac{4}{9} * \frac{1}{4}= \frac{1}{9} \\ 12)5: \frac{1}{9} =5*9=45 \\ 13)45-45=0$