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3(x^2-2)-(5-6x^2)=3x^2-6-5+6x^2=9x^2-11
-3(1-2y)+1/6(6-12y)=-3+6y+1-2y=-2+4y
-(x-2)-4(1/2-x)=-x+2-2+4x=5x
a) -4(2x+0,5)= -8x - 2
b) 3(x²-2)-(5-6x²)= 3x² - 6 - 5 +6x² = 9x² - 11
c) -3(1-2y)+jedna szósta (6-12y)=-3 +6y +1 -2y = -2+4y
d) -(x-2)-4(jedna druga -x)= - x +2 - 2 +4x = 5x