Question

1)х ÷ 2,8 = 5÷7 2)12÷7=9÷х3)6,5÷5,2=х÷84)4,5÷3,6=х÷4 15)15÷4=х÷1 _ 3

Answer 1

х:8/9=3:4

х*4=8/9*3

х*4=8/3

х=8/3:4

х=2/3

Ответ:х=2/3

х:2,8=5:7

х*7=2,8*5

х*7=14

х=14:7

х=2

Ответ:х=2

12:7=9:х

х*12=7*9

х*12=63

х=63:12

х=5,25

Ответ:х=5,25

6,5:5,2=х:8

х*5,2=8*6,5

х*5,2=52

х=52:5,2

х=10

Ответ:х=10

4,5:3,6=х:4

х*3,6=4,5*4

х*3,6=18

х=18:3,6

х=5

Ответ:х=5

15:4=х:11/3

х*4=15*11/3

х*4=55

х=55:4

х=13,75

Ответ:х=13,75

Answer 2

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Answer 3

Let's solve each of these equations step by step:

1. x ÷ 2.8 = 5 ÷ 7 To solve for x, you can cross-multiply: 7x = 2.8 * 5 7x = 14 Now, divide both sides by 7 to isolate x: x = 14 / 7 x = 2

2. 12 ÷ 7 = 9 ÷ x To solve for x, cross-multiply: 12x = 7 * 9 12x = 63 Now, divide both sides by 12 to isolate x: x = 63 / 12 x = 21 / 4

3. 6.5 ÷ 5.2 = x ÷ 8 To solve for x, cross-multiply: 5.2x = 6.5 * 8 5.2x = 52 Now, divide both sides by 5.2 to isolate x: x = 52 / 5.2 x = 10

4. 4.5 ÷ 3.6 = x ÷ 4 To solve for x, cross-multiply: 3.6x = 4.5 * 4 3.6x = 18 Now, divide both sides by 3.6 to isolate x: x = 18 / 3.6 x = 5

5. 15 ÷ 4 = x ÷ (1 - 3) First, calculate the value inside the parentheses: 1 - 3 = -2 Now, the equation becomes: 15 ÷ 4 = x ÷ (-2) To solve for x, cross-multiply: 4x = 15 * (-2) 4x = -30 Now, divide both sides by 4 to isolate x: x = -30 / 4 x = -15/2

So, the solutions are:

1. x = 2
2. x = 21/4
3. x = 10
4. x = 5
5. x = -15/2