Question

ПОМОГИТЕ СРОЧНО!!!!! (ЗАРАНЕЕ СПАСИБО)Решите уравнения:а) 3,5х-2,3х+3,8=4,28б) 4,7у-(2,5у+12,4)=1,9в) (8,3-к)*4,7=5,64

Answer 1

3,5х-2,3х+3,8=4,28
3,5x-2,3x=4,28-3,8
1,2x=0,48
x=0,48:1,2
x=0,4
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4,7у-(2,5у+12,4)=1,9
4,7y-2,5y-12,4=1,9
4,7y-2,5y=1,9+12,4
2,2y=14,3
y=14,3:2,2
y=6,5
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(8,3-к)*4,7=5,64
8,3-k=5,64:4,7
8,3-k=1,2
-k=1,2-8,3
-k=-7,1
k=7,1
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Answer 2

Решение уравнений:

а) 3.5x - 2.3x + 3.8 = 4.28

To solve for x, first combine like terms on the left side of the equation:

3.5x - 2.3x = (3.5 - 2.3)x 0.2x + 3.8 = 4.28

Subtract 3.8 from both sides:

0.2x = 4.28 - 3.8 0.2x = 0.48

Now, divide by 0.2:

x = 0.48 / 0.2 x = 2.4

So, the solution for the first equation is x = 2.4.

б) 4.7y - (2.5y + 12.4) = 1.9

First, distribute the negative sign through the parentheses:

4.7y - 2.5y - 12.4 = 1.9

Combine like terms:

(4.7y - 2.5y) - 12.4 = 1.9 2.2y - 12.4 = 1.9

Add 12.4 to both sides:

2.2y = 1.9 + 12.4 2.2y = 14.3

Finally, divide by 2.2:

y = 14.3 / 2.2 y ≈ 6.5

The solution for the second equation is y ≈ 6.5.

в) (8.3 - k) * 4.7 = 5.64

First, distribute the 4.7:

8.3 * 4.7 - k * 4.7 = 5.64

Now, subtract 8.3 * 4.7 from both sides:

k * 4.7 = 8.3 * 4.7 - 5.64 k * 4.7 = 38.81 - 5.64 k * 4.7 = 33.17

Finally, divide by 4.7:

k = 33.17 / 4.7 k ≈ 7.05

The solution for the third equation is k ≈ 7.05.