Question

1)Cho A= x⁵ - 100x⁴ + 100x³ -100x² +100x -9

 Tính A khi x=99

 

Answer 1

x=99 nên x+1=100

A=x^5-x^4(x+1)+x^3(x+1)-x^2(x+1)+x(x+1)-9

=x^5-x^5-x^4+x^4+...+x^2+x-9

=x-9

=90