Question

Exercitiu 13 tot va rog Dau coroana!​

Answer 1

Răspuns:

Explicație pas cu pas:

7x - 7 = 6 -3 (x + 1)

7x - 7 = 6 - 3x - 3

10x = 7 + 6 - 3 = 10

x = 1

_________

3x - 4 = x + 2(x - 2)

3x - 4 = x + 2x - 4

3x - 4 = 3x - x

x apartine lui Z

____________

x(x + 1) = x^2 + 2x + 1

x^2 + x - x^2 - 2x = 1

-x = 1

x = -1

_____________

2(2x - 5) = 4 (x - 2) - 6

4x - 10 = 4x - 8 - 6

-10 = -14

nu are solutii

_______________

5(1 - 2x) + 1 = 4(x + 3) + 8

5 - 10x + 1 = 4x + 12 + 8

6 - 20 = 4x + 10x

14x = -14

x = -1

_________________

-10{-2 -2[(-4)^5 : 4^4 - 2]} = -2x

-10[ -2 - 2(-4 - 2)] = -2x

-10 (-2 +12) = -2x

-10*10 = -2x

-100 = -2x

x = 50