M(x) = \(x^3\) - \(30x^2\) - 31x + 1
= (\(x^3\) - \(31^2\) ) + (\(x^2\) - 31x) + 1
= \(x^2\)(x - 31) + x(x - 31) + 1
= 1
Nguyễn Thị Khánh Huyền
M( x ) = x3 - 30x2 - 31x +1
= ( x3 - 31x2 ) + ( x2 - 31x ) + 1
= x2 ( x - 31) + x( x - 31) + 1
= 1
^^ Học tốt!