Question

(3.7x-1.24) × 2.5 =8 (4.2y- 3.96) × 1.5= 8.55 20 балов 25 пж

Answer 1

1) (3,7x-1,24)*2,5=8

9,25х-3,1=8

9,25x=8+3,1

9,25x=11,1 |:9,25

x=1,2

Ответ: 1,2

2) (4,2y-3,96)*1,5=8,55

6,3y-5,94=8,55

6,3у=8,55+5,94

6,3у=14,49

у=2,3

Ответ: 2,3

Answer 2

To solve this system of equations, we need to isolate the variables x and y. Let's start with the first equation:

(3.7x-1.24) × 2.5 = 8

First, we can simplify the left-hand side of the equation by multiplying out the parentheses:

9.25x - 3.1 = 8

Next, we can isolate the variable x by adding 3.1 to both sides of the equation:

9.25x = 11.1

Finally, we can solve for x by dividing both sides of the equation by 9.25:

x = 1.2

So the first equation gives us x = 1.2. Now let's move on to the second equation:

(4.2y - 3.96) × 1.5 = 8.55

Again, we can start by multiplying out the parentheses:

6.3y - 5.94 = 8.55

Next, we can isolate the variable y by adding 5.94 to both sides of the equation:

6.3y = 14.49

Finally, we can solve for y by dividing both sides of the equation by 6.3:

y = 2.3

So the second equation gives us y = 2.3.

Therefore, the solution to the system of equations is x = 1.2 and y = 2.3.