Question

A)1,3÷3,9= х÷0,6 б) у÷4,2=3,4÷5,1​

Answer 1

Ответ:

Пошаговое объяснение:

a)1,3÷3,9= х÷0,6

х=1,3*0,6:3,9

х=0,2

б) у÷4,2=3,4÷5,1​

у= 4,2*3,4:5,1

у= 2,8

Answer 2

Ответ:

а)  х = 0,2

б) у = 2,8

Пошаговое объяснение:

Пропорция: в правильной пропорции произведение средних членов равно произведению её крайних членов и наоборот:

a)1,3÷3,9= х÷0,6

  3,9*х = 1,3*0,6

  3,9х = 0,78

  х = 0,78 : 3,9

  х = 0,2

б) у÷4,2=3,4÷5,1​

   5,1*у = 4,2*3,4

   5,1у = 14,28

   у = 14,28/5,1

   у = 2,8

Answer 3

To solve these two equations, you can follow these steps:

A) 1. $1,3 ÷ 3,9 = \frac{1.3}{3.9}$ (Replace the comma with a decimal point.) 2. Simplify the fraction: $\frac{1.3}{3.9} = \frac{13}{39}$ (Multiply both the numerator and denominator by 10 to get rid of the decimal point.)

3. Now, you have $\frac{13}{39} = \frac{x}{0.6}$ (Let $x$ be the unknown.)
4. To solve for $x$, you can set up a proportion:

$\frac{13}{39} = \frac{x}{0.6}$

5. Cross-multiply:

$13 * 0.6 = 39 * x$

6. Simplify:

$7.8 = 39x$

7. Solve for $x$ by dividing both sides by 39:

$x = \frac{7.8}{39} = 0.2$

So, the solution to equation A is $x = 0.2$.

B) 1. $у ÷ 4.2 = \frac{у}{4.2}$ (Replace the comma with a decimal point.) 2. You have $\frac{у}{4.2} = \frac{3.4}{5.1}$ (Replace the comma with a decimal point.)

3. To solve for $у$, set up a proportion:

$\frac{у}{4.2} = \frac{3.4}{5.1}$

4. Cross-multiply:

$у * 5.1 = 3.4 * 4.2$

5. Simplify:

$5.1у = 14.28$

6. Solve for $у$ by dividing both sides by 5.1:

$у = \frac{14.28}{5.1} \approx 2.8$

So, the solution to equation B is $у \approx 2.8$.