Question

3)(5х):13=8:52; 4)10,5:21=(4х):20;

Answer 1

Пошаговое объяснение:

Решаем как пропорцию:

(5х):13=8:52

5х=13*8:52

5х=2

х=0,4

10,5:21=(4х):20

4х=10,5*20:21

4х=10

х=2,5

Answer 2

It seems like you've provided two mathematical equations. Let's solve them step by step:

Equation 1: $\frac{5x}{13} = \frac{8}{52}$ Equation 2: $\frac{10.5}{21} = \frac{4x}{20}$

Equation 1: Simplify both sides of the equation: $\frac{5x}{13} = \frac{1}{6}$ Now, cross-multiply to solve for $x$: $5x \cdot 6 = 13 \cdot 1$ $30x = 13$ $x = \frac{13}{30}$

Equation 2: Simplify both sides of the equation: $\frac{10.5}{21} = \frac{1}{2}$ Now, cross-multiply to solve for $x$: $4x \cdot 2 = 20 \cdot 1$ $8x = 20$ $x = \frac{20}{8}$ $x = \frac{5}{2}$

So, the solutions to the equations are:

1. $x = \frac{13}{30}$
2. $x = \frac{5}{2}$