Question

1) (5,1a+1,8)-3,4a , a = 1 , a = 1,5 2) (x-18,2)+3,8 = 15,6 3) ч+16,23-15,8 = 7,1

Answer 1

1)1.7a+1.8
a=1
1.7×1+1.8=3.5
а=1.5
1.7×1.5+1.8=4.35
2)x=15.6-3.8+18.2
x=30
3)ч=7.1-16.23+15.8
ч=6.67

Answer 2

Let's solve each of the equations one by one:

1. (5,1a+1,8) - 3,4a, where a = 1:

Substituting a = 1 into the equation: (5,1(1)+1,8) - 3,4(1) = 5,1 + 1,8 - 3,4 = 6,9 - 3,4 = 3,5

Therefore, when a = 1, the expression (5,1a+1,8) - 3,4a equals 3,5.

Now, let's solve it for a = 1.5:

(5,1(1,5)+1,8) - 3,4(1,5) = 5,1(1,5) + 1,8 - 3,4(1,5)

Multiplying: 7,65 + 1,8 - 5,1 = 9,45 - 5,1 = 4,35

Therefore, when a = 1.5, the expression (5,1a+1,8) - 3,4a equals 4,35.

2. (x-18,2) + 3,8 = 15,6:

We can solve this equation for x:

Subtracting 3.8 from both sides: (x-18.2) = 15.6 - 3.8 x - 18.2 = 11.8

Adding 18.2 to both sides: x = 11.8 + 18.2 x = 30

Therefore, the solution to the equation (x-18.2) + 3.8 = 15.6 is x = 30.

3. ч + 16.23 - 15.8 = 7.1:

To solve for ч, we'll isolate the variable:

Subtracting 16.23 and 15.8 from both sides: ч = 7.1 - 16.23 + 15.8 ч = 7.1 - 0.43 ч = 6.67

Therefore, the solution to the equation ч + 16.23 - 15.8 = 7.1 is ч = 6.67.