一、1/4(x^+y^)-1/2xy (^等于平方)二、75x^-27x* (^等于平方,*等于六次方)三、x^-4y^+x+2y (^等于平方)
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![一、1/4(x^+y^)-1/2xy (^等于平方)二、75x^-27x* (^等于平方,*等于六次方)三、x^-4y^+x+2y (^等于平方)](/uploads/image/z/225781-61-1.jpg?t=%E4%B8%80%E3%80%811%2F4%EF%BC%88x%5E%2By%5E%29-1%2F2xy+%EF%BC%88%5E%E7%AD%89%E4%BA%8E%E5%B9%B3%E6%96%B9%EF%BC%89%E4%BA%8C%E3%80%8175x%5E-27x%2A+%28%5E%E7%AD%89%E4%BA%8E%E5%B9%B3%E6%96%B9%2C%2A%E7%AD%89%E4%BA%8E%E5%85%AD%E6%AC%A1%E6%96%B9%EF%BC%89%E4%B8%89%E3%80%81x%5E-4y%5E%2Bx%2B2y+%EF%BC%88%5E%E7%AD%89%E4%BA%8E%E5%B9%B3%E6%96%B9%EF%BC%89)
一、1/4(x^+y^)-1/2xy (^等于平方)二、75x^-27x* (^等于平方,*等于六次方)三、x^-4y^+x+2y (^等于平方)
一、1/4(x^+y^)-1/2xy (^等于平方)
二、75x^-27x* (^等于平方,*等于六次方)
三、x^-4y^+x+2y (^等于平方)
一、1/4(x^+y^)-1/2xy (^等于平方)二、75x^-27x* (^等于平方,*等于六次方)三、x^-4y^+x+2y (^等于平方)
如下:
一、1/4(x²+y²)-1/2xy
=1/4(x²+y²-2xy)
=1/4(x-y)²
二、75x²-27x^6
=3x²(25-9x^4)
=3x²(5+3x²)(5-3x²)
=3x²(5+3x²)(√5 +√3 x)(√5 -√3 x)
三、x²-4y²+x+2y
=(x+2y)(x-2y)+(x+2y)
=(x+2y)(x-2y+1)
1/4(x^+y^-2xy)=1/4(x-y)^
3x^(25-9x^4)
(x-2y+1)(x+2y)
1.1/4(x+y)^
2.
1/4(X^+y^-2xy)=1/4(x-y)^
3(25x^-9X*) =3(5x+3x')(5x-3x') ('=3次方)
(x+2y)(x-2y)+x+2y=(x+2y)(x-2y+1)
最佳最佳,我想了好久的
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