Question

Cho B= x⁶ - 20x⁵ - 20x⁴- 20x³-20x²-20x+3

Tính B khi x= 21

Answer 1

x=21

=>x-1=20

B=x^6-x^5(x-1)-x^4(x-1)-...-x(x-1)+3

=x^6-x^6+x^5-x^5+x^5-...-x^2+x+3

=x+3

=21+3=24