Bài 1 : Tính
\(a,A=1^2-2^2+3^2-4^2+...-2004^2+2005^2\)
\(b,B=\left(2+1\right)\left(2^2+1\right)\left(2^4+1\right)\left(2^8+1\right)\left(2^{16}+1\right)\left(2^{32}+1\right)-2^{64}\)
\(c,R\left(x\right)=x^4-17x^3+17x^2-17x+20\) với x=16
\(d,S\left(x\right)=x^{10}-13x^9+13x^8-13x^7+...+13x^2-13x+10\) với x=12