因式分解:1、4a³-a;2、6xy²-9x²y-y³;3、解方程:x-2分之1-x=2-x分之1-(2);4、计算:(x-y)²-(x+y)(x-y)
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![因式分解:1、4a³-a;2、6xy²-9x²y-y³;3、解方程:x-2分之1-x=2-x分之1-(2);4、计算:(x-y)²-(x+y)(x-y)](/uploads/image/z/1644706-10-6.jpg?t=%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3%EF%BC%9A1%E3%80%814a%26%23179%3B-a%EF%BC%9B2%E3%80%816xy%26%23178%3B-9x%26%23178%3By-y%26%23179%3B%EF%BC%9B3%E3%80%81%E8%A7%A3%E6%96%B9%E7%A8%8B%EF%BC%9Ax-2%E5%88%86%E4%B9%8B1-x%3D2-x%E5%88%86%E4%B9%8B1-%EF%BC%882%29%EF%BC%9B4%E3%80%81%E8%AE%A1%E7%AE%97%EF%BC%9A%EF%BC%88x-y%EF%BC%89%26%23178%3B-%EF%BC%88x%2By%EF%BC%89%EF%BC%88x-y%EF%BC%89)
因式分解:1、4a³-a;2、6xy²-9x²y-y³;3、解方程:x-2分之1-x=2-x分之1-(2);4、计算:(x-y)²-(x+y)(x-y)
因式分解:1、4a³-a;2、6xy²-9x²y-y³;3、解方程:x-2分之1-x=2-x分之1-(2);
4、计算:(x-y)²-(x+y)(x-y)
因式分解:1、4a³-a;2、6xy²-9x²y-y³;3、解方程:x-2分之1-x=2-x分之1-(2);4、计算:(x-y)²-(x+y)(x-y)
1、4a³-a
=a(4a²-1)
=a(2a+1)(2a-1)
2、6xy²-9x²y-y³
=-y(9x²-6xy+y²)
=-y(3x-y)²
3、解方程:
x-2分之1-x=2-x分之1-(2)
(1-x)/(x-2)=-1/(x-2) -2
乘以x-2得
1-x=-1-2(x-2)
1-x=-1-2x+4
-x+2x=3-1
x=2
经检验,x=2时,分母x-2=0,为增根
所以原方程无解
4、计算:
(x-y)²-(x+y)(x-y)
=x²-2xy+y²-(x²-y²)
=x²-2xy+y²-x²+y²
=2y²-2xy
=2y(y-x)
怎么老是显示不正常啊