Question

Вычислите : X³+x³yдробьx²+2xy+y² где x=3
y=-2

Answer 1

(xˇ3+yˇ3)/(xˇ2+2xy+yˇ2)=(x+y)(xˇ2-xy+yˇ2)/(x+y)(x+y)=
=(xˇ2-xy+yˇ2)/(x+y)
x=3,y=-2 :  (9+6+4)/(3-2)=19/1=19