a) \(M\left(x\right)=P\left(x\right)+Q\left(x\right)+2019\)
\(=-3x^5+x^2-1009+\frac{1}{2}x^4-8x^3+x-2x^3+3x^5+\frac{1}{2}x^4-1010+2019\)
\(=x^4-10x^3+x^2+x\)
b) \(K\left(x\right)=Q\left(x\right)-P\left(x\right)+1\)
\(=x-2x^3+3x^5+\frac{1}{2}x^4-1010+3x^5-x^2+1009-\frac{1}{2}x^4+8x^3+1\)
\(=6x^5+6x^3-x^2+x\)
M(x) = P(x) + Q(x) + 2019
= -3x5 + x2 - 1009 + 1/2x4 - 8x3 + x - 2x3 + 3x5 + 1/2x4 - 1010 + 2019
= ( 3x5 - 3x5 ) + ( 1/2x4 + 1/2x4 ) + ( 2x3 - 8x3 ) + x2 + x + ( -1010 - 1009 + 2019 )
= x4 - 6x3 + x2 + x
K(x) = Q(x) - P(x) + 1
= x - 2x3 + 3x5 + 1/2x4 - 1010 - ( -3x5 + x2 - 1009 + 1/2x4 - 8x3 ) + 1
= x - 2x3 + 3x5 + 1/2x4 - 1010 + 3x5 - x2 + 1009 - 1/2x4 + 8x3 + 1
= ( 3x5 + 3x5 ) + ( 1/2x4 - 1/2x4 ) + ( 8x3 - 2x3 ) - x2 + x + ( 1009 - 1010 + 1 )
= 6x5 + 6x3 - x2 + x
Sửa M(x)
= ( 3x5 - 3x5 ) + ( 1/2x4 + 1/2x4 ) + ( -2x3 - 8x3 ) + x2 + x + ( -1010 - 1009 + 2019 )
= x4 - 10x3 + x2 + x