a) 4x + 28 - 2x = 8 + 3x -6 2x + 28 = 2 + 3x -x = -26 x = 26 b) 5x + 10 - 3x + 3 = 2 2 x + 13 = 2 2x = -11 x = -5,5 c) 12 x - 72 + 72 = 11x + 5 12 x = 11x + 5 x = 5 d) (x-1)*(6 - 5 - 4) = 6 (x-1)* (-3) = 6 -3x + 3 = 6 -x + 1 = 2 -x = 1 x = -1 e) 2 x + 8 = 11* (x-3) 2 x + 8 = 11x -33 2x - 11x = -33 - 8 -9x = -41 x = 41/9 = 4 i 5/9 f) 12x - 9*(x-2) = 5x + 13 12x - 9x+ 18 = 5x + 13 3x + 18 = 5x + 13 3x-5x = 13 - 18 -2x = -5 x = 2,5
a) 4(x+7)-2x=8+3(x-2) 4x+28-2x=8+3x-6 2x+28=3x+2-2x 28=x+2-2 26=x b) 5(x+2)-3(x-1)=2 5x+10-3x+3=2 2x+7=2-7 2x=-5:2 x=2,5 c) 12(x-6)+72=11x+5 12x-72+72=11x+5 12x=11x+5-11x x=5 d) 6(x-1)-5(x-1)-4(x-1)=6 6x-6-5x+5-4x+4=6 -3x+3=6-3 3x=-3:3 x=-1 e) 2x+8=11(x-3) 2x+8=11x-33-8 2x=11x-25-11x -9x=-25 9x=25:9 x=2i7/9(ułamek zwykły) f) 12x-9(x-2)=5x+13 12x-9x+18=5x+13 3x+18=5x+13-13 3x+5=5x-3x 5=2x:2 2,5=x Mam nadzieje że pomogłam ;-)