Question

1. Solutia reala a ecuatiei -0,2+4= -1,2x este....
2. Rezolvand ecuatia 2x+6= -0,8(3) se obtine solutia...
3. Solutia ecuatiei 2x-5/6 (5 supra 6 sau 5 pe 6) = -3/14 (3 pe 14) este....
4. Ecuatia |2x-3| = 5 are solutiile....
5. Rezolvati ecuatiile:
a) 4(x+5) - 3(x-3)= 2(x+15)
b) 2[15+3(x-1)]= 4(x+7)
Muuultumesc frumoss!

Answer 1

1)-0,2+4=-1,2x
1,2x=-3,8
12x/10=-38/10
12x=-38
x=-38/12
x=-19/6

2. Rezolvand ecuatia 2x+6= -0,8(3) se obtine solutia...
0,8(3)=83-8/90=75/90=25/45=5/9
2x+6=-5/9
2x=-5/9-6
2x=(-5-54)/9
2x=-59/9
x=-59/2·9=-59/18=-3,2(7)
4. Ecuatia |2x-3| = 5 are solutiile....-1, 4
daca 2x-3=5
2x=5+3
x=8/2=4
daca 2x-3=-5
2x=-5+3
x=-2/2=-1

5. Rezolvati ecuatiile:
a) 4(x+5) - 3(x-3)= 2(x+15)
4x+20-3x+9=2x+30
x+29=2x+30
x-2x=30-29
-x=1    (-1)
x=-1
b) 2[15+3(x-1)]= 4(x+7)
2(15+3x+3)=4x+28
2(18+3x)=4x+28
36+6x=4x+28
6x-4x=28-36
2x=-8
x=-8/2
x=-4