分解因式x*x-4y*y-x+2y
答案:6 悬赏:20 手机版
解决时间 2021-01-28 08:47
- 提问者网友:情歌越听越心酸
- 2021-01-27 19:36
分解因式x*x-4y*y-x+2y
最佳答案
- 五星知识达人网友:轻熟杀无赦
- 2021-01-27 19:45
原式做以下变换:
x*x-4y*y-x+2y
=x*x-x+1/4-(4y*y-2y+1/4)
=(x-1/2)(x-1/2)-(2y-1/2)(2y-1/2)
利用平方差公式:
=(x-1/2+2y-1/2)(x-1/2-2y+1/2)
=(x+2y-1)(x-2y)
x*x-4y*y-x+2y
=x*x-x+1/4-(4y*y-2y+1/4)
=(x-1/2)(x-1/2)-(2y-1/2)(2y-1/2)
利用平方差公式:
=(x-1/2+2y-1/2)(x-1/2-2y+1/2)
=(x+2y-1)(x-2y)
全部回答
- 1楼网友:玩家
- 2021-01-27 22:36
x*x-4y*y-x+2y
=(x-2y)(x+2y)-(x-2y)
=(x-2y)(x+2y-1)
- 2楼网友:大漠
- 2021-01-27 22:28
x*x-4y*y-x+2y
=x^2-(2y)^2-(x-2y)
=(x+2y)(x-2y)-(x-2y)
=(x-2y)(x+2y-1)
- 3楼网友:傲气稳了全场
- 2021-01-27 21:20
x*x-4y*y-x+2y
=(x-2y)(x+2y)-(x-2y)
=(x-2y)(x+2y-1)
- 4楼网友:末日狂欢
- 2021-01-27 20:51
x*x-4y*y-x+2y =(x+2y)(x-2y)-(x-2y)=(x+2y-1)(x-2y)
- 5楼网友:猎心人
- 2021-01-27 20:32
原式=(x-2y)(x-y+x-3y)-2(x-3y)(x-4y)
=(x-2y)(2x-4y)- 2(x-3y)(x-4y)
=2(x-2y)方- 2(x-3y)(x-4y)
=2[(x-2y)方-(x-3y)(x-4y)]
=2[x方+4y方-4xy-(x方-7xy+12y方)]
=2(3xy-8y方)
=2y(3x-8y)
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