解原试=2x*2x-4*xy-3y2-4*x+10y-3 =(2x-3y+1)(2x+y-3)这是个规律建议看一看(倍数训练)
十字相乘2x,-3y,12x,y,-3=(2x-3y+1)(2x+y-3)
十字相乘 2x,-3y,1 2x,y,-3 =(2x-3y+1)(2x+y-3)