Odpowiedzi

2010-03-09T20:49:26+01:00
A) (A*B)*C A = 3x²-xy B = -2y C = 3x

[(3x²-xy)*(-2y)]*3x=(-6x²y+6y²)*3x=-18x³y+18xy²

b) A*(B*C)
3x²-xy*(-2y*3x)=3x²-xy*(-3xy)=-9x³y+3x²y²

c) (A+B)*C
[(3x²-xy)+(-2y)]*3x=(3x²-xy-2y)*3x=9x³-3x²y-6xy

d) A*C + B*C
(3x²-xy)*(-2y)+(-2y)*(3x)=-6x²y+6y²+(-6xy)=-6x²y+6y²-6xy