Question

Exercitiul nr 3 pag 89​

Answer 1

a) 5x=15 => x=3

b)4x=4 => x=1

c) -3x=-12 => x=4

d) -2x=200 => x=-100

e)42=7x=> x=6

f)10x=-11 => x=-1,1

Dar x€Z

=> x nu are sol reale

g) 3x=10 => x=10/3

dar x€Z

=> x nu are sol reale

h)-1+2x=-37

2x=-36=>x=-18

Answer 2

Răspuns:

a)5x-15=0/+15

5x=15/:5=

x=3

c)-3x+11=-1/-11

-3x=-12/:(-3)

x=+4

e)21=7x-21

21+21=7x

42=7x

7x=42/:7

x=6

g)2x+x=-20-10

3x=-30/:3

x=-10