Question

1. Rezolvati ecuatiile :
a) 2(x+1) =8,x apartine N
b) 3(x+2) =2x+5,,x aprtine Z
c) 5(2x-4)=3(4x+2),x apartine Z
d) 2(3x-1,6)-3=2x+1,x partine Q
e) -4(x+ radical din 2 )-3(x+radical din 2 ) =-11x +2 radical din 2 ,x apartine R
f) 0,5(x-2) = 3x+4(x-1/2),x apartine R

2. Rezolvati in multimea R ecuatiile
a) 3x+5=2
b) 3x-8=5-7x
c) 3x-1/2=3/2
d)5x-4/3=7
e) 3x+7/2=3/2
f) x+1 = 2(x-1)
g)3(x-2)-4(x-1)=-7(x+2)
h) 2 radical din 2 +3=2x+3radical din 2

Answer 1

a)2(x+1)=8
=>2*x+2*1=8
=>2x+2=8
=>2x=8-2
=>2x=6
=>x=6:2
=>x=3
S={3}

Answer 2

a) 2(x+1)=8
2x+2=8
2x=8-2
2x=6
x=6/2
x=3

b)3(x+2)=2x+5
3x+6-2x-5=0
x+1=0
x= -1

c) 5(2x-4)=3(4x+2)
10x-20=12x+6
10x-20-12x-6=0
-2x-26=0
-2x=26
x=26/-2
x= -13