a) P(x) + Q(x) = x⁴−5x³+4x−5+(-x⁴+3x²+2x+1)

= ( x⁴-x⁴ )- 5x³+3x² + (4x+2x) + (−5+1)

= - 5x³ +3x² +6x - 4

b) Từ : P(x)=R(x)+Q(x)

Suy ra : R(x) = P(x)-Q(x)

= x⁴ - 5x³+4x - 5 - (-x⁴+ 3x²+2x+1)
=(x⁴ +x⁴ ) - 5x³ - 3x²+(4x - 2x)+(-5 -1)

= 2x⁴ -5x³ - 3x²+2x - 6

a) P(x) + Q(x) = x⁴−5x³+4x−5+(-x⁴+3x²+2x+1)

= ( x⁴-x⁴ )- 5x³+3x² + (4x+2x) + (−5+1)

= - 5x³ +3x² +6x - 4

b) Từ : P(x)=R(x)+Q(x)

Suy ra : R(x) = P(x)-Q(x)

= x⁴ - 5x³+4x - 5 - (-x⁴+ 3x²+2x+1)
=(x⁴ +x⁴ ) - 5x³ - 3x²+(4x - 2x)+(-5 -1)

= 2x⁴ -5x³ - 3x²+2x - 6

a) P(x) + Q(x) = x⁴−5x³+4x−5+(-x⁴+3x²+2x+1)

= ( x⁴-x⁴ )- 5x³+3x² + (4x+2x) + (−5+1)

= - 5x³ +3x² +6x - 4

b) Từ : P(x)=R(x)+Q(x)

Suy ra : R(x) = P(x)-Q(x)

= x⁴ - 5x³+4x - 5 - (-x⁴+ 3x²+2x+1)
=(x⁴ +x⁴ ) - 5x³ - 3x²+(4x - 2x)+(-5 -1)

= 2x⁴ -5x³ - 3x²+2x - 6

a) P(x) + Q(x) = x⁴−5x³+4x−5+(-x⁴+3x²+2x+1)

= ( x⁴-x⁴ )- 5x³+3x² + (4x+2x) + (−5+1)

= - 5x³ +3x² +6x - 4

b) Từ : P(x)=R(x)+Q(x)

Suy ra : R(x) = P(x)-Q(x)

= x⁴ - 5x³+4x - 5 - (-x⁴+ 3x²+2x+1)
=(x⁴ +x⁴ ) - 5x³ - 3x²+(4x - 2x)+(-5 -1)

= 2x⁴ -5x³ - 3x²+2x - 6