1. 5x + 4 = x + 12 2. 13 – 5y = 8 – 2y 3. 5x + (3x – 7) = 9 4. 3y – (5 – y) = 11 5....

Question

1. 5x + 4 = x + 12
2. 13 – 5y = 8 – 2y
3. 5x + (3x – 7) = 9
4. 3y – (5 – y) = 11
5. (7a + 1) – ( 6a + 3) = 5
6. (8s + 11) – 13 = 9s– 5
7. (5x – 3)+(7x – 4) = 8 – (15 – 11x)
8. (7 – 5k) – (8 – 4k) + (5k + 6) = 8
9. 2x + 5 = 2(x + 1) + 11
10. 15(v + 2) – 30 = 15v
11. 5(3x + 1,2) + x = 6,8
12. 0,4b + 3 = 0,2(3b + 1) – b
13. 6(x – 1) = 9,4 – 1,7x

Answer 1

1. 5х-х=12-4
4х=8
х=2
2. 5у-2у=13-8
3у=5
у=1 2/3

3. 5х+3х=9+7
8х=16
х=2

4. 3у+у=11+5
4у=16
у=4

5. 7а-6а=5-1+3
а=7

6.9s-8s=11-13+5
s=3

7. (5x – 3)+(7x – 4) = 8 – (15 – 11x)
5х+7х-11х=8-15+3+4
х=0

8.(7 – 5k) – (8 – 4k) + (5k + 6) = 8
5к+4к-5к=8-7+8-6
4к=3
к=3/4
9.2x + 5 = 2(x + 1) + 11
2х=2х+2+11-5
2х=2х+18

10.

Answer 2

1. 5x + 4 = x + 12               5х-х=12-4   4х=8   х = 2
2. 13 – 5y = 8 – 2y            13-8=5у-2у     5=3у   у = 3/5
3. 5x + (3x – 7) = 9            2х = 9 + 7 =16    х = 8
4. 3y – (5 – y) = 11            3у-5+у=11      4у=11+5=16     у = 4
5. (7a + 1) – ( 6a + 3) = 5   7а+1- 6а-3=5    а=5-1+3=7  а=7
6. (8s + 11) – 13 = 9s– 5    8s-2=9s-5    5-2=9s-8s    s=3
7. (5x – 3)+(7x – 4) = 8 – (15 – 11x)  5x-3+7x+4=8-15+11x    5x+7x-11x=8-15+3-4      x= - 8
8. (7 – 5k) – (8 – 4k) + (5k + 6) = 8  7-5k-8+4k+5k+6=8    4k=8-7+8-6=3 k=3/4
9. 2x + 5 = 2(x + 1) + 11  2x+5=2x+2+11    2x-2x=2+11-5    0=8 Не бывает
10. 15(v + 2) – 30 = 15v  15v+30-30=15v  15v-15v=30-30   0 = 0 при любом значении v равенство верно
11. 5(3x + 1,2) + x = 6,8        15x+6+x=6.8   16x=6.8 - 6 = 0.8  x=0.05
12. 0,4b + 3 = 0,2(3b + 1) – b       0.4b+3=0.6b+0.2-b     3-0.2=0.6b-b-0.4b   2.8= - 0.8b  b= - 3.5
13. 6(x – 1) = 9,4 – 1,7x     6x-6=9.4-1.7x    6x+1.7x=9.4+6   7.7x=15.4  x=  2

Comments

Извини, во втором номере не 3/5. а наоборот 5/3 или 1 2/3