wykonaj działania :
matematyka z plusem 2
str 91 zad 20
d) x(x+1)(x+2)-x(x-1)(x-2)
musi wyjsc 6x2 (do kwadratu)
x(x+1)(x+2)-x(x-1)(x-2)=x(x²+3x+2)-x(x²-3x+2)=x³+3x²+2x-x³+3x²-2x=6x²
d) x(x+1)(x+2)-x(x-1)(x-2)=
= x3 + 2x2 + x2 +2x - x3 + 2x2 + x2 -2x =
= 6x2
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x(x+1)(x+2)-x(x-1)(x-2)=x(x²+3x+2)-x(x²-3x+2)=x³+3x²+2x-x³+3x²-2x=6x²
d) x(x+1)(x+2)-x(x-1)(x-2)=
= x3 + 2x2 + x2 +2x - x3 + 2x2 + x2 -2x =
= 6x2