计算（2x-3y)(x+4y)-(3x+y)(x-2y)（2x-3y)(x+4y)-(3x+y)(x-2y)_数学解答

计算（2x-3y)(x+4y)-(3x+y)(x-2y)
（2x-3y)(x+4y)-(3x+y)(x-2y)

人气：499 ℃　时间：2019-10-09 00:38:11

解答

原式=(2x²+8xy-3xy-12y²)-(3x²-6xy+xy-2y²)
=2x²+8xy-3xy-12y²-3x²+6xy-xy+2y²
=-x²+10xy-10y²