祢好,我帮祢解答
首先,X^2-XY+2Y^2=(X-2Y)(X+Y)
所以,设x^2-xy-2y^2-x+5y-2可分解成
(X-2Y+A)(X+Y+B)
则展开有X的一次项=A+B=-1
Y的一次项有A-2B=5
连列成方程,解出A=1 B=-2
所以有原式可以分解为:(X-2Y+1)(X+Y-2)
看不明白的地方可以发信息给我
猜你喜欢
- 1可以到银行换 一角二角 1元 2元 5元 10元 100元
- 2已知水平推力F的作用下,A.B做加速运动,不计摩擦,A对B的作用力为?若有摩擦系数
- 3以元音音标开头的字母
- 4Jack‘s grandmother ___for more than twenty years.A has dead B has been died C has been died
- 5abac型式的词语,列:bc要反义词
- 6如图:已知在△ABC中,AB=AC,D为BC上任意一点,DE∥AC交AB于E,DF∥AB交AC于F,求证:DE+DF=AC.
- 7I would like to play football.同义句
- 8已知AB等于CD,AE垂直BC,DF垂直BC,CE等于BF,试问AB平行CD吗
- 91.The journey around the world took the old sailor nine months,_______ the sailing time was 226days.
- 10直接引语改成间接引语时next time要不要变改成the next time?