3000 cây

Nhớ click cho mik nha !!!!!!!!!!!!!

a) \(P\left(x\right)=x^5+3x^3+4x^2+2x-4\)

\(Q\left(x\right)=x^5-x^4-2x^3+3x+4\)

b) \(P\left(x\right)+Q\left(x\right)=\left(x^5+3x^3+4x^2+2x-4\right)+\left(x^5-x^4-2x^3+3x+4\right)\)

\(P\left(x\right)+Q\left(x\right)=\left(x^5+x^5\right)-x^4+\left(3x^3-2x^3\right)+4x^2+\left(2x+3x\right)+\left(-4+4\right)\)

\(P\left(x\right)+Q\left(x\right)=2x^5-x^4+x^3+4x^2+5x\)

Dễ quá.

Vuthithu 2002