Question

AM SELECTAT 50 de pct. Cine îmi rezolva ex. Astea le primește și plus și o coroana .
10**Rezolvați ecuatiile:
c) 2 (4x-5)+3 (3x+2)=7 (x+1)-1
d)5 (3x-1)+4 (2x-7)=5 (4x-1)-4
e) 9 (4x-1)+2 (5x+3)=3 (2x+1)+34
f)3 (2x-1)+x=2 (x+12)-8

Answer 1

c) 2 (4x-5)+3 (3x+2)=7 (x+1)-1
8x-10+9x+6=7x+7-1
17x-7x=7-1+10-6
10x=10
x=10:10
x=1

d)5 (3x-1)+4 (2x-7)=5 (4x-1)-4
15x-5+8x-28=20x-5-4
23x-20x=-5-4+5+28
3x=24
x=24:3
x=8

e) 9 (4x-1)+2 (5x+3)=3 (2x+1)+34
36x-9+10x+6=6x+3+34
46x-6x=37+9-6
40x=40
x=40:40
x=1

f)3 (2x-1)+x=2 (x+12)-8
6x-3+x=2x+24-8
7x-2x=16+3
5x=19
x=19:5
x=3,8