Cho các đa thức:M(x),N(x),P(x).Hãy tính N(x)-P(x)+M(x)
Giải thích
N(x)−P(x)+M(x)=3x4−2x+2x3−−8+5x−6x3+−5+3x2−4x4+x3
=3x4−2x+2x3+8−5x+6x3−5+3x2−4x4+x3
=3x4−4x4+2x3+6x3+3x2−(5x+2x)+(8−5)
=−x4+8x3+3x2−7x+3
N(x)−P(x)+M(x)=3x4−2x+2x3−−8+5x−6x3+−5+3x2−4x4+x3
=3x4−2x+2x3+8−5x+6x3−5+3x2−4x4+x3
=3x4−4x4+2x3+6x3+3x2−(5x+2x)+(8−5)
=−x4+8x3+3x2−7x+3