d: \(D=8x^3-36x^2+54x-27+2049\)
\(=\left(2x-3\right)^3+2049=2049\)
c: \(=\left(x+3\right)^3=100^3=10^6\)
b: \(=x^3-3x^2+3x-1-x-9\)
\(=\left(101-1\right)^3-101-9\)
\(=100^3-110=999890\)
a) A = x² - y² = (x - y)(x + y)
Thay x = 87; y = 13 vào A, ta có:
A = (87 - 13)(87 + 13)
= 74 . 100 = 7400