a) 2x + x = 12 + 2 - 5 3x = 9 / :3 x = 3 b) -3x + 5x = 0 - 7 + 1 2x = -6 / :2 x= -3 c) 4x - x = 9 - 2 - 7 3x= - 18 / :3 x = -6 Licze na naj ;)
a) 2x+5+x-2= 12 2x+x=12+2-5 3x= 9 x=3 spr... 2*3+5+3-2=12 6+5+3-2=12 12=12 L=P b) -3x-1 +5x +7=0 -3x+5x=1-7 2x=-6 x=-3 spr... -3*(-3) -1+5*(-3)+7=0 9-1 +(-15)+7=0 8-15+7=0 7-7=0 0=0 L=P c) 4x+7-x+2=9 4x-x=9 -7-2 3x= 0 spr... 4*0+7-0+2=9 9=9 L=P