ZADANIE 8
a)2x(x-5)-3(x²-2x)+(x-2)x=2x²-10x-3x²+6x+x²-2x=-6x
b)a(a+b+c)-b(a-b+c)-c(a-b-c)=a²+ab+ac-ab+b²-bc-ac+bc+c²=a²+b²+c²
c) x(x²+2x+1)-(-4x³+8x²-6):2=x³+2x²+x-(-2x³+4x²-3)=x³+2x²+x+2x³-4x²+3=
=3x³-2x²+x+3
ZADANIE 9
a) 3(x²-2x+3)-2(x²-5x-1)=3(4-4+3)-2(4-10-1)=9+14=23
b) a(2ab+b)-b(a-2ab+a²)=0,1(-2-10)+10(0,1+2+0,01)=-1,2+21,1=19,9
