原式=(2x²+8xy-3xy-12y²)-(3x²-6xy+xy-2y²)
=2x²+8xy-3xy-12y²-3x²+6xy-xy+2y²
=-x²+10xy-10y²
计算(2x-3y)(x+4y)-(3x+y)(x-2y)
计算(2x-3y)(x+4y)-(3x+y)(x-2y)
(2x-3y)(x+4y)-(3x+y)(x-2y)
(2x-3y)(x+4y)-(3x+y)(x-2y)
数学人气:836 ℃时间:2019-10-09 00:38:11
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