Đáp án:
Giải thích các bước giải:
a)
P(x)=3x^5 +5x -4x^4 -2x^3 + 6 + 4x^2
P(x)=3x^5-4x^4-2x^3+ 4x^2+5x+ 6
Q(x)= 2x^4 - x + 3x^2 - 2x^3 + 1/4 - x^5
Q(x)= - x^5+2x^4- 2x^3+ 3x^2- x+ 1/4
b)
P(x) +Q(x)= 3x^5-4x^4-2x^3+ 4x^2+5x+ 6- x^5+2x^4- 2x^3+ 3x^2- x+ 1/4
P(x) +Q(x)= (3x^5- x^5)-(4x^4-2x^4)-(2x^3+ 2x^3)+ (4x^2+ 3x^2)+(5x- x)+(6+1/4)
P(x) +Q(x)= 3x^5-2x^4-4x^3+7x^2+4x+25/4
P(x)-Q(x)=3x^5-4x^4-2x^3+ 4x^2+5x+ 6+ x^5-2x^4+ 2x^3- 3x^2+ x- 1/4
P(x)-Q(x)=(3x^5+ x^5)-(4x^4+2x^4)-(2x^3- 2x^3)+ (4x^2- 3x^2)+(5x+x)+(6-1/4)
P(x)-Q(x)=4x^5-6x^4+x^2+6x+23/4