Question

3×(6+а)=45 (30-n):2=9 7×b-15=6;

Answer 1

3*(6+а)=45

18+3а=45

3а=27

а=9

 

 

7б-15=6

7б=21

б=3

 

12-40:к=4

40:к=-8

к=5

Answer 2

1) 3*(6+а)=45
18+3а=45
3а=45-18
3а=27
а=27:3
а=9
Ответ: 9.
2) (30-n):2=9
30-n=9*2
30-n=18
n=30-18
n=12
Ответ: 12.
3) 7*b-15=6
7*b=15+6
7*b=21
b=21:7
b=3
Ответ: 3.

Answer 3

To solve the given equations, we need to find the values of variables 'а', 'n', and 'b'. Let's go through each equation step by step:

1. 3×(6+а) = 45

To solve for 'а', first, distribute the 3 on the left side of the equation:

3 × 6 + 3а = 45

Now, simplify the left side:

18 + 3а = 45

Next, isolate 'а' by moving the constant term to the other side:

3а = 45 - 18

3а = 27

Finally, divide both sides by 3 to find the value of 'а':

а = 27 / 3

а = 9

So, 'а' is equal to 9.

2. (30 - n) / 2 = 9

To solve for 'n', first, multiply both sides by 2 to get rid of the fraction:

2 × (30 - n) = 9

Now, simplify the left side:

60 - 2n = 9

Next, isolate 'n' by moving the constant term to the other side:

-2n = 9 - 60

-2n = -51

Finally, divide both sides by -2 to find the value of 'n':

n = -51 / -2

n = 25.5

So, 'n' is equal to 25.5.

3. 7 × b - 15 = 6

To solve for 'b', first, move the constant term to the other side:

7 × b = 6 + 15

7 × b = 21

Now, divide both sides by 7 to find the value of 'b':

b = 21 / 7

b = 3

So, 'b' is equal to 3.

To summarize:

а = 9 n = 25.5 b = 3