Câu trả lời:
=x3−2x2y+2y2x+2x2y−2xy2+4y3−x3−4xy2−x2y−4y3=x3−2x2y+2y2x+2x2y−2xy2+4y3−x3−4xy2−x2y−4y3
=−x2y−4xy2=−x2y−4xy2
=−xy(x+4y)
20182.2018x=201862018x=20186:201822018x=20184x=4
2x.24=272x.24=27
x=7−4=3
60+3x=910:9860+3x=9260+3x=813x=21x=7