Question

A)3,5x-2,3x+3,8=4,28 Б)4,7y-(2,5y+12,4)=1,9 В)(8,3-k)×4,7=5,64 Г)(9,2-m):3,2=1,6

Answer 1

А)3,5х-2,3х+3,8=4,28
3,5х-2,3х=4,28-3,8
1,2х=0,48 | : 1,2
х=0,4
Ответ: х=0,4

б)4,7у-(2,5у+12,4)=1,9
4,7у-2,5у-12,4=1,9
4,7у-2,5у=1,9+12,4
2,2у=14,3 |: 2,2
у=6,5
Ответ: у=6,5

в)(8,3-k)*4,7=5,64
39,01-4,7k=5,64
-4,7k=5,64-39,01
-4,7k=-33,37 | : (-4,7)
k=7,1
Ответ: k=7,1

г)( 9,2-m):3,2=1,6
9,2-m=1,6*3,2
9,2-m=5,12
-m=5,12-9,12
-m=-4 |: (-1)
m=4
Ответ: m=4

Answer 2

А) 1,2х=0,48
х=0,48:1,2
х=0,4
Б) 4,7у-2,5у-12,4=1,9
2,2у=14,3
у=14,3:2,2
у=6,5
В)39,01-4,7k=5,64
-4,7k=-33,37
k=(-33,37):(-4,7)
k=7,1
Г)9,2:3,2-m/3,2=1,6
2,875-m/3,2=1,6
-m/3,2=1,6-2,875
-m/3,2=-1,275
-m=-1,275×3,2
-m=-4,08
m=4,08

Answer 3

A) To solve for x in the equation 3.5x - 2.3x + 3.8 = 4.28:

First, simplify the left side of the equation by combining like terms:

3.5x - 2.3x = 1.2x

So the equation becomes:

1.2x + 3.8 = 4.28

Subtract 3.8 from both sides:

1.2x = 0.48

Divide both sides by 1.2:

x = 0.4

Therefore, the solution is x = 0.4.

B) To solve for y in the equation 4.7y - (2.5y + 12.4) = 1.9:

First, simplify the left side of the equation by distributing the negative sign:

4.7y - 2.5y - 12.4 = 1.9

Combine like terms:

2.2y - 12.4 = 1.9

Add 12.4 to both sides:

2.2y = 14.3

Divide both sides by 2.2:

y = 6.5

Therefore, the solution is y = 6.5.

C) To solve for k in the equation (8.3 - k) × 4.7 = 5.64:

First, simplify the left side of the equation by multiplying:

39.01 - 4.7k = 5.64

Subtract 39.01 from both sides:

-4.7k = -33.37

Divide both sides by -4.7:

k = 7.1

Therefore, the solution is k = 7.1.

D) To solve for m in the equation (9.2 - m) : 3.2 = 1.6:

First, simplify the left side of the equation by dividing:

2.875 - 0.3125m = 1.6

Subtract 2.875 from both sides:

-0.3125m = -1.275

Divide both sides by -0.3125:

m = 4.08

Therefore, the solution is m = 4.08.