Question

urgent va rog faceti ecuatiile astea 1)7x-14=5x-2 2)5(x+1)=2(x-1) 3)2(2x-5)=3(x-2)+7 4)4(x-7=5(x+1)+10x

Answer 1

Răspuns:

Explicație pas cu pas:

1) 7x-14=5x-2  <=>

Trecem termenii asemenea de aceeasi parte ,

cu semn schimbat.

7x - 5x = 14 - 2  <=>

2x = 12  => x = 12:2  => x = 6

2) 5(x+1)=2(x-1)  <=>

5x + 5 = 2x - 2 <=>

5x - 2x = -2 -5 <=>

3x = -7  => x = -7/3

3) 2(2x-5)=3(x-2)+7 <=>

4x - 10 = 3x - 6 +7 <=>

4x - 3x = 10 +1 <=>

x = 11

4) 4(x-7)=5(x+1)+10x <=>

4x - 28 = 5x +5 + 10x <=>

4x - 5x - 10x = 28 +5 <=>

-11 x = 33 => x = 33/(-11) => x = -3