初一的一个计算题，快来啊

(x-4y)(2x+3y)(x+2y)(x-y)
=[(x-4y)(2x+3y)][(x+2y)(x-y)]
=(2x^2+3xy-8xy-12y^2)(x^2-xy+2xy-2y^2)
=(2x^2-5xy-12y^2)(x^2+xy-2y^2)
=2x^4+2x^3y-4x^2y^2-10x^3y-5x^2y^2+10xy^3-12x^2y^2-12xy^3+24y^4
=2x^4-8x^3y-21x^2y^2-2xy^3+24y^4

这题有点麻烦。希望你能满意！

,;mlpk;, ol ,/.l,. /

(x-4y)(2x+3y)(x+2y)(x-y)
=2x^4-3x^3y-21x^2y^2+48y^4-30xy^3

(x-4y)(2x+3y)(x+2y)(x-y)
=(x-4y)(x-y)*(2x+3y)(x+2y)
=(x^2-xy-4xy+4y^2)*(2x^2+4xy+3xy+6y^2)
=2x^4-4x^2y^2-12x^2y^2+24y^4
=2x^4-16x^2y^2+24y^4
。。。。。。。。。。。。。。。