Помогите решить. Математика. 6 класс.

Ответ:

Пошаговое объяснение:

а)=3/4*8/5=6/5=1 1/5

б)=28/9*15/34=70/51=1 19/51

в)=4/5*5/24=1/6

г)=2 3/8:1 1/4=19/8*4/5=19/10

2 2/19*19/10=40/19*19/10=4

2) 1 2/7x=2 5/14-1 3/7

1 2/7x=2 5/14-1 6/14

9/7x=13/14

x=13/14:9/7=13/14*7/9

x=13/18

3/8x-1/4=4,5:2 2/5

3/8x-1/4=9/2*5/12

3/8x-1/4=15/8

3/8x=15/8+1/4

3/8x=15/8+2/8

3/8x=17/8

x=17/8:3/8=17/8*8/3

x=17/3=5 2/3

x+1 1/7x=5 5/14

2 1/7x=5 5/14

x=5 5/14:2 1/7

x=75/14*7/15

x=5/2=2 1/2 первое число

1 1/7*2 1/2=8/7*5/2=20/7=2 6/7 второе число

$1)a) \frac{3}{4} \div \frac{5}{8} = \frac{3}{4} \times \frac{8}{5} = \frac{6}{5} = 1 \frac{1}{5}$
Б)
$\frac{28}{9} \div \frac{34}{15} = \frac{28}{9} \times \frac{15}{34} = \frac{14\times 5}{3 \times 17} = \\ = \frac{70}{51} = 1 \frac{19}{51}$
В)
$\frac{4}{5} \div \frac{24}{5} = \frac{4}{5} \times \frac{5}{24} = \frac{1}{6}$
Г)
$2 \frac{2}{19} \times (2 \frac{3}{8} \div 1 \frac{1}{4} ) =4 \\ \frac{19}{8} \div \frac{5}{4} = \frac{19}{8} \times \frac{4}{5} = \frac{19}{10 }$
$\frac{40}{19} \times \frac{19}{10} = 4$
2)
$a)1 \frac{2}{7} x = 2 \frac{5}{14} - 1 \frac{3}{7} = \\ 2 \frac{5}{14} - 1 \frac{6}{14} = 1 \frac{19}{14} - 1 \frac{6}{14} = \frac{13}{14}$
$x = \frac{13}{14} \div 1 \frac{2}{7} = \frac{13}{14} \times \frac{7}{9} = \frac{13}{18}$
Б)