Question

помогите пожалуйста ​

Answer 1

$( \frac{3}{7} - \frac{6}{21} ) \times 2 \frac{1}{7} + ( \frac{11}{15} + 0.3) \div 12 \frac{2}{5} = \frac{1}{7} \times 2 \times \frac{1}{7} + ( \frac{11}{15} + \frac{3}{10} ) \times \frac{1}{12} \times \frac{2}{5} = \frac{2}{49} + \frac{31}{30} \times \frac{1}{12} \times \frac{2}{5} = \frac{2}{49} + \frac{31}{15} \times \frac{1}{12} \times \frac{1}{5} = \frac{2}{49} + \frac{31}{900} = \frac{3319}{44100}$

Answer 2

Пошаговое объяснение:

(3/7-6/21)×2 1/7+(11/15+0,3):

:12 2/5=229/588

1) 3/7-6/21=(9-6)/21=3/21=1/7

2) 11/15+0,3=11/15+3/10=(22+9)/30=31/30

3) 1/7×2 1/7=1/7×15/7=15/49

4) 31/30:12 2/5=

=31/30:62/5=31/30×5/62=1/12

5) 15/49+1/12=(180+49)/588=229/588