我女儿的一道初二数学题对下式进行因式分解：2x²＋xy-y²-3x+3y-2
2019-04-12
我女儿的一道初二数学题
对下式进行因式分解：2x²＋xy-y²-3x+3y-2
优质解答
2x²＋xy-y²-3x+3y-2 =（2x-y)(x+y)-3x+3y-2设2x²＋xy-y²-3x+3y-2 =(2x-y+m)(x+y+n)=2x²＋xy-y²+(2n+m)x+(-n+m)y+mn所以2n+m=-3-n+m=3mn=-2解得 m=1,n=-2所以2x²＋xy-y²-3...
2x²＋xy-y²-3x+3y-2 =（2x-y)(x+y)-3x+3y-2设2x²＋xy-y²-3x+3y-2 =(2x-y+m)(x+y+n)=2x²＋xy-y²+(2n+m)x+(-n+m)y+mn所以2n+m=-3-n+m=3mn=-2解得 m=1,n=-2所以2x²＋xy-y²-3...