Question

1)15:6=45:x 2) x/0, 3=1, 8/2, 7 3)0, 2x+5/3=3x-1/7 срочно решите уравнения,если получилось дробное число запишите его в виде десятичной дроби​

Answer 1

Ответ:

Пошаговое объяснение:

15 : 6 = 45 : х

15 * х = 6 * 45

15х = 270

х = 270 : 15

х = 18

х/0,3 = 1,8/2,7

2,7 * х = 1,8 * 0,3

2,7х = 0,54

х = 0,54 : 2,7

х = 0,2

(0,2х+5)/3 = (3х-1)/7

7 * (0,2х + 5) = 3 * (3х - 1)

1,4х + 35 = 9х - 3

1,4х - 9х = -3 - 35

-7,6х = -38

х = -38 : (-7,6)

х = 5

Answer 2

1. 15:6 = 45:x

To solve this proportion, we can cross-multiply:

15 * x = 6 * 45

15x = 270

Now, divide both sides by 15 to isolate x:

x = 270/15

x = 18

So, the solution to the equation is x = 18.

2. x/0, 3 = 1, 8/2, 7

Dividing by zero is undefined. In this equation, the denominator is zero (0), which means the equation has no solution.

3. 0, 2x + 5/3 = 3x - 1/7

Let's simplify the equation first:

0, 2x + 5/3 = 3x - 1/7

To eliminate the fractions, we can multiply the entire equation by the least common multiple (LCM) of the denominators, which is 21:

21 * (0, 2x + 5/3) = 21 * (3x - 1/7)

0 * 21 + 21 * (2x + 5/3) = 3 * 21x - 1 * 3

0 + 7(2x + 5) = 63x - 3

14x + 35 = 63x - 3

Now, let's isolate the variable terms on one side and the constant terms on the other side:

14x - 63x = -3 - 35

-49x = -38

To solve for x, divide both sides by -49:

x = (-38) / (-49)

x ≈ 0.7755 (rounded to four decimal places)

So, the solution to the equation is x ≈ 0.7755.