Question

rezolvati,in multimea numerelor naturale, ecuoatiile: 7(x-2)+9=44. 8(x+3)+7=71,. 5(2x-11)+17=52,6(3x+4)+15=201, 17(2x+3)-25=366, 4(5x-12)-34=118, 125-3(2x-1)=98,. 238-5(x-1)=193

Answer 1

a) 7 (x-2) + 9 = 44

7 (x-2) = 35

7x - 14 = 35

7x = 49 => x = 7

b) 8 (x+3) + 7 = 71
8x + 24 = 64
8x = 40 => x = 5

c) 5 (2x-11) + 17 = 52
10x - 55 + 17 = 52
10x -  38 = 52
10x = 90 => x = 9

d) 6 (3x+4) + 15 = 201
18x + 24 + 15 = 201
18x + 39 = 201
18x = 162 => x = 9

e) 17 (2x+3) - 25 = 366
34x + 51 - 25 = 366
34x + 26 = 366
34x = 340 => x = 10

f) 4 (5x-12) - 34 = 118
20x - 48 - 34 = 118
20x - 82 = 118
20x = 200 => x = 10

g) 125 - 3(2x-1) = 98
125 - 6x + 3 = 98
- 6x = 98 -3 - 125
- 6x = -30 => x = 5

h) 238 - 5(x-1) = 193
238 - 5x + 5 = 193
- 5x = 193 - 5 - 238
- 5x = -50 => x = 10

Daca nu ai inteles vreo etapa ma poti intreba ulterior.

Answer 2

7x-14+9=44         8x+31=71        10x-38=52        18x+39=201
7x-5=44               8x=71-31         10x=52+38       18x=201-39
7x=44=5              x=40:8             x=90:10             x=162:18
x=47:7                 x=5                  x=9                      x=9
x=7

34x+26=366        20x-82=118        128-6x=98         243-5x=193
34x=366-26        20x=118+82        -6x=98-128        -5x=193-243
x=340;34            x=200:20             x=-30:-6             x=-50:-5
x=10                   x=10                     x=5                   x=10