(x-3)(x2 + 3x + 9)-(54 + x3)
= (x-3)(x2+3x+32)-(54+x3)
= x3 - 33 - (54+x3)
= x3 - 27 - 54 - x3
= -27-54 = -81
Chúc bạn học tốt !^^
\(\left(x-3\right)\left(x^2+3x+9\right)-\left(54+x^3\right)\)
=\(x^3-27-54-x^3=-81\)
a) (x-3)(x2+3x+9)-(54+x3)
= x3 - 33 - (54+x3)
= x3-33-54-x3
=-27-54
=-81
(x-3)(x2 +3x +9)-(54 +x3)
= x3 +3x2 + 9x -3x2 - 9x -27 -54 -x3
= -81