解答
展开 (1−x)2(1−x+y)2(x−y)24x2(3x+y)4
解答
x6−4x5y−4x5+6x4y2+14x4y+6x4−4x3y3−18x3y2−18x3y−4x3+x2y4+10x2y3+19x2y2+10x2y+x2−2xy4−8xy3−8xy2−2xy+y4+2y3+y2324x6+432x5y+216x4y2+48x3y3+4x2y4
求解步骤
(1−x)2(1−x+y)2(x−y)24x2(3x+y)4
(1−x)2=1−2x+x2
=(x2−2x+1)(y+1−x)2(x−y)24x2(3x+y)4
(1−x+y)2=−2xy−2x+x2+2y+y2+1
=(x2−2x+1)(x2−2xy−2x+y2+2y+1)(x−y)24x2(3x+y)4
(x−y)2=x2−2xy+y2
=(x2−2x+1)(x2−2xy−2x+y2+2y+1)(x2−2xy+y2)4x2(3x+y)4
(3x+y)4=81x4+108x3y+54x2y2+12xy3+y4
=(x2−2x+1)(x2−2xy−2x+y2+2y+1)(x2−2xy+y2)4x2(81x4+108x3y+54x2y2+12xy3+y4)
乘开 (1−2x+x2)(−2xy−2x+x2+2y+y2+1)(x2−2xy+y2):x6−4x5y−4x5+6x4y2+14x4y+6x4−4x3y3−18x3y2−18x3y−4x3+x2y4+10x2y3+19x2y2+10x2y+x2−2xy4−8xy3−8xy2−2xy+y4+2y3+y2
=x6−4x5y−4x5+6x4y2+14x4y+6x4−4x3y3−18x3y2−18x3y−4x3+x2y4+10x2y3+19x2y2+10x2y+x2−2xy4−8xy3−8xy2−2xy+y4+2y3+y24x2(81x4+108x3y+54x2y2+12xy3+y4)
乘开 4x2(81x4+108x3y+54x2y2+12xy3+y4):324x6+432x5y+216x4y2+48x3y3+4x2y4
=x6−4x5y−4x5+6x4y2+14x4y+6x4−4x3y3−18x3y2−18x3y−4x3+x2y4+10x2y3+19x2y2+10x2y+x2−2xy4−8xy3−8xy2−2xy+y4+2y3+y2324x6+432x5y+216x4y2+48x3y3+4x2y4