Question

1. Rezolvati in Z următoarele ecuații:
a) 2x +9=3-(x + 2);
b) 5(1-2x) + 1-4(X+3)+8;
d) - 2.(x+1)+3.(x + 2)= -X+8;
c) |2x - 3|=11.​

Answer 1

Răspuns:

a) 2x +9=3-(x + 2)

2x+9=3-x-2

2x+x=-2-9

3x=-11

x=-11/3

b) 5(1-2x) + 1-4(X+3)+8

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

=-14x+2

d) - 2.(x+1)+3.(x + 2)= -X+8

-2x-2+3x+6=-x+8

-2x+3x+x=8-6+2

7x=4

x=4/7

c) |2x - 3|=11.

2x-3=11

2x=11+3

2x=14

x=14:2

x=7

sau

3-2x=11

-2x=11-3

-2x=8

x=8:(-2)

x=-4