1) 2x-9= 7+x 2x-x=7+9 x=16 2) 2(1-x)=-3x-61+4x 2-2x=-3x-61+4x -2x+3x-4x=-61-2 -3x=-63 /:(-3) x=21 3) 2x-5(0,2x-5)=3(x-5)-20 2x-x+25=3x-15-20 2x-x-3x=-15-20-25 -2x=-60 /:(-2) x=30 4) 2x+3(22-x)=x-3(8-x) 2x+66-3x=x-24+3x 2x-3x-x-3x=-24-66 -5x=-90 /:(-5) x=18 5) 2(x-1)-3(1+3x)=3x-7(6+x)-5 2x-2-3-9x=3x-42-7x-5 2x-9x-3x+7x=-42-5+2+3 -3x=-42 /:(-3) x=14
zaczne od 2 podpunktu 2(1-x)=-3x-61+4x 2-2x=x-61|-2 -2x=x+63|-x 3x=63|:3 x=21 2x-5(0,2x-5)=3(x-5)-20 2x-x+25=3x-15-20 x+25=3x+35|-25 x=3x+10|-3x 2x=10|:2 x=5 2x+3(22-x)=x-3(8-x) 2x+66-3x=x-24+3x -x+66=4x-24|-66 -x=4x+90|-4x 5x=90|:5 x=18 2(x-1)-3(1+3x)=3x-7(6+x)-5 2x-2-3-9x=3x-42-7x-5 -7x+5=-4x+47|-5 -7x=-4x+42|+4x -3x=42|:(-3) x=14
z.63 2z-9= 7+x ( z czy x?? stawiam na x :-) 2x-9= 7+x 2x-x = 7+9 x = 16 2(1-x)=-3x-61+4x 2-2x = -3x-61+4x -2x-4x+3x = -61-2 -3x = -63 |:(-3) x = 21 2x-5(0,2x-5)=3(x-5)-20 2x-x+25 = 3x-15-20 x-3x = -35-25 -2x = -60 |:(-2) x = 30 2x+3(22-x)=x-3(8-x) 2x+66-3x = x-24+3x 2x-3x-x-3x = -24-66 -5x = -90 |:(-5) x = 18 2(x-1)-3(1+3x)=3x-7(6+x)-5 2x-2-3-9x = 3x-42-7x-5 2x-9x-3x+7x = -42-5+5 -3x = -42 |:(-3) x = 14 z.62 2/3x+3 1/2 = 4,3 2/3x = 4,3-3,5 2/3x = 0,8 x = 1,2 7/3+10/9x = 22/9 10/9x = 22/9 -7/3 10/9x = 1/9 x = 0,1 28/5 = 4,6+0,5x -0,5x = -28/5+4,6 -0,5x = -1 |:(-0,5) x = 2 10x-3,75 = 61/4 10x = 61/4+3,75 10x = 19 x = 1,9 5x-4,6 = 0,9 5x = 0,9+4,6 5x = 5,5 x = 11/10 x = 1,1 0 = 3x-0,9 -3x = -0,9 x = 0,3 3/8 = 5/2x-0,125 -5/2x = -0,125-3/8 -5/2 x =- 500/1000 -5/2 x = -0,5 x = 0,2 x/3-1/4 = 0,45 |*12 4x-3 = 5,4 4x = 5,4+3 4x = 8,4 x = 2,1 2,78-x = 1,78 -x = 1,78-2,78 -x = -1 x = 1
