Question

3. Решите уравнения: a) 45-2(3x-8) = 31 b) 50-676: (x + 23) = 24 c) 120 : (x + 21) + 12 = 17 50-676: (x + 23) = 24 d) e) g) h) i) 3(x + 2) -x= 10 j) 4x + 3(x-7) = 5 8 = 3(x - 4) - x 3(x-1) + x = 2x 5 - x = 4(x - 3) 5(x + 4) + x = 6 3(x - 7) - 6x = -x 34 - 2(2x - 9) = 28 1) k)​

Answer 1

Ответ:

а)45-2(3х-8)

3х-8=45-2

3х-8=43

3х=43+8

3х=51

х=51÷3

х=17

Answer 2

Ответ:

а)45-2(3x-8)=31

45-5x+16=31

61-6x=31

-6x=31-61

-6x=-30

x=-30:(-6)

x=5

b)50-676:(x+23)=24

50-676

------ =24

x+23

-676

------- = 24-50=-26

x+23

676=(x+23)×26

676=26x+598

-26x=598-676

-26x=-78

x=-78:(-26)

x=3