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2[4x - 4y - 3x] - 4[3x - 2x +3y]=
8x-8y-6x-12x+8x-12y=-2x-20y=-2*(-3,5)-20*(5/6)=
7-50/3=21/3-50/3=-29/3
dla x = -3,5 i y= 5/6
b) a - 2(b - 1) + 2[ -5(a+1) - 0,5a] + 2b =
a - 2b +2 + 2[ -5a-5 - 0,5a] + 2b =
a-2b+2-10a-10-a+2b=-10a-8=-10(4/5)=-8
dla a = 4/5 i b = 1/4
c) 3x - 2(-5 + y) - 5[-3x + 2(y - 1)] - 10(5y - 4) =
3x +10 -2 y - 5[-3x + 2y - 2] - 50y +40 =
3x+10-2y+15x-10y+10-50y+40=
18x-62y+60=18*(-1/3)-62*(-4)+60=
-6+248+60=302
dla x = -1/3 i y = -4
b)4/5-2(1/4-1)+2[-5(4/5+1)-0,5*4/5]+2*1/4=
=4/5-1/2+2+2(-4-5-2/5)+1/2=2,3-8-10-4/5+1/2=-16
c)3*(-1/3)-2(-5-4)-5[1+2(-4-1)]-10(-20-4)=
=-1+10+8-5(-11)+200+40=17+55+200+40=312
2[4x - 4y - 3x] - 4[3x - 2x +3y]=
8x-8y-6x-12x+8x-12y=-2x-20y=-2*(-3,5)-20*(5/6)=
7-50/3=21/3-50/3=-29/3
dla x = -3,5 i y= 5/6
b) a - 2(b - 1) + 2[ -5(a+1) - 0,5a] + 2b =
a - 2b +2 + 2[ -5a-5 - 0,5a] + 2b =
a-2b+2-10a-10-a+2b=-10a-8=-10(4/5)=-8
dla a = 4/5 i b = 1/4
c) 3x - 2(-5 + y) - 5[-3x + 2(y - 1)] - 10(5y - 4) =
3x +10 -2 y - 5[-3x + 2y - 2] - 50y +40 =
3x+10-2y+15x-10y+10-50y+40=
18x-62y+60=18*(-1/3)-62*(-4)+60=
-6+248+60=302
dla x = -1/3 i y = -4