Question

Помогите решить по математике!!

2 4/5 + 3 1/4, 6 - 3/7, 2 1/3 - 2/3

Answer 1

Ответ:

Пошаговое объяснение:

$\displaystyle 2\frac{4}{5} +3\frac{1}{4} =\frac{14}{5} +\frac{13}{4} =\frac{56}{20} +\frac{65}{20} =\frac{56+65}{20} =\frac{121}{20} =6\frac{1}{20} =6.05$

$\displaystyle 6-\frac{3}{7} =5\frac{7}{7} -\frac{3}{7} =5\frac{4}{7}$

$\displaystyle 2\frac{1}{3} -\frac{2}{3} =1\frac{4}{3} -\frac{2}{3} =1\frac{2}{3}$

Answer 2

$2 \times \frac{4}{5} + 3 \times \frac{1}{4} = ( 2 + 3) + ( \frac{4}{5} + \frac{1}{4} ) = 5 + \frac{21}{20} = 5 + 1 \times \frac{1}{20} = 6 + \frac{1}{20} = 6 \times \frac{1}{20}$

$6 - \frac{3}{7} = \frac{42 - 3}{7} = \frac{39}{7} = 5 \times \frac{4}{7}$

$2 \times \frac{1}{3} - \frac{2}{3} = \frac{7}{3} - \frac{2}{3} = \frac{5}{3} = 1 \times \frac{2}{3}$