Cho các đa thức A=5x^3y-4xy^2-6x^2y^2
Giải thích
A−B−C
=5x3y−4xy2−6x2y2−−8xy3+xy2−4x2y2−x3+4x3y−6xy3−4xy2+5x2y2
=5x3y−4xy2−6x2y2+8xy3−xy2+4x2y2−x3−4x3y+6xy3+4xy2−5x2y2
=x3y−xy2−7x2y2+14xy3−x3
A−B−C
=5x3y−4xy2−6x2y2−−8xy3+xy2−4x2y2−x3+4x3y−6xy3−4xy2+5x2y2
=5x3y−4xy2−6x2y2+8xy3−xy2+4x2y2−x3−4x3y+6xy3+4xy2−5x2y2
=x3y−xy2−7x2y2+14xy3−x3