Cho các đa thức :M(x)=-5+3x^2-4x^4+x^3 ;N(x)=3x^4-2x+2x^3;P(x)=-8+5x
Giải thích
M(x)−N(x)=−5+3x2−4x4+x3−3x4−2x+2x3
=−5+3x2−4x4+x3−3x4+2x−2x3
=−4x4+3x4+x3−2x3+3x2+2x−5
=−7x4−x3+3x2+2x−5
M(x)−N(x)=−5+3x2−4x4+x3−3x4−2x+2x3
=−5+3x2−4x4+x3−3x4+2x−2x3
=−4x4+3x4+x3−2x3+3x2+2x−5
=−7x4−x3+3x2+2x−5