Question

Rezolvati ecuatiile:
a) 2(x+1)=8,x apartine Q
b)3(x-2)=2x+5,x apartine R
c)5(2x-4)=3(4x+2),x apartine R
d)x-2(x+1)=2x,xapartine Z
e)2 supra 9 x=4 supra 3
f)-3supra 5y=0
g)2,5=4x
h)y-1 supra 2+y+3 supra 3 =5 supra 12
i)3x-1 supra x+2 =3x supra x-1

Answer 1

a) 2x + 2 = 8 => 2x = 8-2 => 2x = 6 => x = 3 
b)3x -6 = 2x + 5 => 3x-2x= 11 => x=11
c) 10x - 20 = 12x +6 => -2x =26 => x = -13
d) x-2x+2 =2x => -3x =-2 => 3x = 2 => x = 2/3
e) 2/9x =4/3 
f) -3/5y = 0 => y=0
g) 2,5 = 4x => x = 2.5/4
h) y-1/2+y+3/3 = 5/12 => 3y-3/5 + y = 5/12 =>1) 3y -3 = 5 = 3y= 8.... 2) 5+ y = 12  Paremi-se ca ori e scris gresit ori y are 2 valori dar trebuiau sa dea y egal intre ele si eu zic ca am calculat corect