zad . 6 a) 9+x=1 * 7/8 | * 8 72 + 8x = 8 * 7 72 + 8x = 56 8x = 56 - 72 8x = - 16 | : 8 x = - 2 d) 6 * 1/8y = 1 | * 8 48 * y = 8 y = 8 - 48 y = 40 g) 8a + 4 = 36 8a = 36 - 4 8a = 32 | : 8 a = 4 j) -3/4 - 1/4l = 2,25 | * 4 - 3 - l = 9 - l = 9 + 3 -l = 12 | * -1 l = - 12 zad . 7 a) 2*(x-1/2)- x + 3 = 3 2x - 1 - x + 3 = 3 x + 2 = 3 x = 1 b) 0 = 3-(2x+1) -6x - 3 = 0 - 6x = 0 + 3 - 6x = 3 | : - 6 x = - 1/2 spr . A : 2(x-1/2)-x+3=3 2(1-1/2)-1 + 3 = 3 2 - 1 - 1 + 3 = 3 0 + 3 = 3 3=3 spr . B : 0 = 3-(2x+1) 3-(2*-1/2+1)=0 -1+1=0 0=0
zad 6 a) 9+x=1 7/8 9+x=15/8 /*8 72+8x=15 /-72 8x= -57 /:8 x= -7 1/8 d) 6 1/8y= 1 49/8y=1 /*8 49y=8 /:49 y= 8/49 g) 8a+4=36 /-4 8a=32 /:8 a= 4 j) -3/4 - 1/4l=2 1/4 -3/4 - 1/4l =5/4 /*4 -3 -l=5 /+3 -l=8 /:(-1) l=-8 zad 7 a) 2(x-1/2) - x+3 =3 2x-1-x+3=3 x+2=3 /-2 x=1 b) 0=3-(2x+1) 0=3(-2x-1) 0=-6x-3 /+3 3=-6x -6x=3 /:(-6) x=-3/6 x=-1/2
