x*y=xy-2x-2y+6
3*2=3*2-2*3-2*2+6=6-6-4+6=2
x o y=xy-3x-3y+12
2o4=2*4-3*2-3*4+12=8-6-12+12=2
x*2(-3)ox calculam pe portiuni:
x*2(-3)=x*2*(-3)-2x-2*2*(-3)+6=-6x-2x+12+6=-8x+18
(-8x+18)ox=(-8x+18)*x-3*(-8x+18)-3x+12= -8 x^2 + 18x + 24x- 54 -3x+12=
= -8 x^2+39 x - 42 --> nu imi da -1 cat trebuie; te rog, revezi daca relatia asta "x*2(-3)ox=-1" ai scris-o corect!
"vorbim" prin Comment! :D