Question

11. Rezolvaţi în Z ecuațiile:
a) 9(x - 2) = -63;
c) 2(4x + 1) = 2(5x – 7);
e) 1 - 4.(-5. (x - 2)] = 21;
gl (x+3)(x - 7) = 0;
b) 5(x + 3) = 2(5x – 5);
d) 2(-x + 5) = -8(3x + 2) + 56;
f) 5(x - 2) – 7(x + 3) + 35 = 0;
h) (-2x + 6)(x + 3) = 0.​

Answer 1

Răspuns:

a).9x-18=-63

9x=-63+18,9x=-45

X=-45/9, X=-9

c).8X+2=10X-14

14-2=10X-8X

12=2X

X=12/2

X=6

e).1-4(-5X+20)=21

1+20X+80=21,

20X=21-81

20X=-60, X=-60/20, X=-3

b).5X+15=10X-10

15++10=10X-5X

25=5X

X=25/5

X=5

g).

d).-2X+10=-24X-16+56

24X-2X =56-16-10

22X=56-26

22X=30

X=30/22impartit cu 2

X=15/11

f).5X-10-7X-21+35=0

-2X +4=0

-2X= -4

X=2

h).-2X-6X+6X+18=0

-2X =-18

X=-18/ -2, X=9

g).