Question

СРОЧНО ПОЖАЛУЙСТА РЕШИТЕ ЗАДАНИЯ 4.42 И 4.43 С ОБЪЯСНЕНИЕМ,А НЕ ПРОСТО ОТВЕТ
ДАМ 50 БАЛЛОВ ,СРОЧНООООЛЛЛ

Answer 1

4.42

$y \div 51.6 = 11.2 \div 34.4 \\ y = \frac{11.2 \times 51.6}{34.4} \\ y = \frac{112 \times 516}{344 \times 10} \\ y = \frac{28 \times 3}{1\times 5} \\ y = \frac{84}{5} \\ y = 16.8$

$5 \frac{3}{5} \div 3 \frac{1}{2} = 5 \frac{1}{4} \div x \\ x = 3 \frac{1}{2} \times 5 \frac{1}{4} \div 5 \frac{3}{5} \\ x = \frac{7 \times 21 \times 5}{2 \times 4 \times 28} \\ x = \frac{105}{32} \\ x = 3 \frac{9}{32}$

$4.5 \div 2.25 = y \div 3.5 \\ y = 4.5 \times 3.5 \div 2.25 \\ y = \frac{9 \times 7 \times 4}{2 \times 2 \times 9} \\ y = 7$

$\frac{25}{6} \div x = \frac{20}{21} \div \frac{4}{7} \\ x = \frac{25}{6} \times \frac{4}{7} \div \frac{20}{21} \\ x = \frac{25 \times 4 \times 21}{6 \times 7 \times 20} \\ x = \frac{5}{2} \\ x = 2.5$

4.43

$\frac{67.8}{a} = \frac{7.62}{6.35} \\ a = \frac{67.8 \times 6.35}{7.62} \\ a = \frac{678 \times 635}{762 \times 10} \\ a = \frac{113}{2} \\ a = 56.5$

$\frac{18.3}{6} = \frac{x}{0.5} \\ x = \frac{18.3 \times 0.5}{6} \\ x = 3.05 \times 0.5 \\ x = 1.525$

$\frac{y}{1.2} = \frac{2.5}{4.8} \\ y = \frac{1.2 \times 2.5}{4.8} \\ y = \frac{12 \times 25}{48 \times 10} \\ x = \frac{5}{8}$

$\frac{6.3}{0.21} = \frac{1.5}{a} \\ a = \frac{0.21 \times 1.5}{6.3} \\ a = \frac{21 \times 15}{63 \times 100} \\ a = \frac{5}{100} \\ a = 0.05$

Answer 2

Пошаговое объяснение:

№42

у : 51,6 = 11,2 : 34,4

34,4 * у = 11,2 * 51,6

34,4у = 577,92

у = 577,92 : 34,4

у = 16,8

5 3/5 : 3 1/2 = 5 1/4 : х

5 3/5 * х = 3 1/2 * 5 1/4

28/5х = 7/2 * 21/4

28/5х = 147/8

х = 147/8 : 28/5

х = 147/8 * 5/28

х = 21/8 * 5/4

х = 105/32

х = 3 9/32

4,5 : 2,25 = у : 3,5

2,25 * у = 4,5 * 3,5

2,25у = 15,75

у = 15,75 : 2,25

у = 7

25/6 : х = 20/21 : 4/7

20/21 * х = 4/7 * 25/6

20/21х = 100/42

х = 100/42 : 20/21

х = 100/42 * 21/20

х = 5/2 * 1/1

х = 5/2

х = 2 1/2

№43

67,8/а = 7,62/6,35

7,62 * а = 6,35 * 67,8

7,62а = 430,53

а = 430,53 : 7,62

а = 56,5

18,3/6 = х/0,5

6 * х = 18,3 * 0,5

6х = 9,15

х = 9,15 : 6

х = 1,525

у/1,2 = 2,5/4,8

4,8 * у = 2,5 * 1,2

4,8у = 3

у = 3 : 4,8

у = 0,625

6,3/0,21 = 1,5/а

6,3 * а = 0,21 * 1,5

6,3а = 0,315

а = 0,315 : 6,3

а = 0,05