Question

8. Решите уравнения: 1) 23.12 +39x – 38x = 817;2) 21 - 20y - 15 - 8 = 11;3)919 - (25х – 24x) = 65 - 8;4) 47.43 - (19y - 18y) = 1502.​

Answer 1

Ответ:

Пошаговое объяснение:

1)

23,12+39х-38х=817

39х-38х=817 -23,12

х=793,88

2)

21-20у-15-8=11

-20у=11-21+15+8

-20у=13

у=-13/20

3)

919-(25х-24х)=65-8

919-х=57

х=919-57

х=862

4)

47,43-(19у-18у)=1502

47,43-у=1502

у=-1502+47,43

у=-1454,57

Answer 2

1. 23.12 + 39x - 38x = 817

Combining like terms on the left side, we have:

23.12 + x = 817

Subtracting 23.12 from both sides, we get:

x = 817 - 23.12

x = 793.88

2. 21 - 20y - 15 - 8 = 11

Combining like terms on the left side, we have:

-20y - 2 = 11

Adding 2 to both sides, we get:

-20y = 13

Dividing both sides by -20, we get:

y = 13 / -20

y = -0.65

3. 919 - (25x - 24x) = 65 - 8

Simplifying the expression inside the parentheses, we have:

919 - x = 57

Subtracting 919 from both sides, we get:

-x = 57 - 919

-x = -862

Multiplying both sides by -1 to solve for x, we get:

x = 862

4. 47.43 - (19y - 18y) = 1502

Simplifying the expression inside the parentheses, we have:

47.43 - y = 1502

Subtracting 47.43 from both sides, we get:

-y = 1502 - 47.43

-y = 1454.57

Multiplying both sides by -1 to solve for y, we get:

y = -1454.57