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x(x+1)(x+2)-x³=901
x²+x(x+2)-x³=901
x³+2x²+x²+2x-x³=901
x³-x³+2x²+x²+2x=901
3x²+2x=901
3x²+2x-901=0
(3x+53)(x-17)=0
3x+53=0 x-17=0
3x= -53 x=17
x= - 53/3 x=17
x=17 numero menor
x+1....17+1=18 numero medio
x+2....17+2=19 numero mayor
los numeros son 17 , 18 y 19
(17)(18)(19)-17³=901
5814-4913=901
901=901