若多项式x的二次方-3xy+ay的二次方分解为(x-5y)(x-by)则a.b的值为
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/05 15:53:26
![若多项式x的二次方-3xy+ay的二次方分解为(x-5y)(x-by)则a.b的值为](/uploads/image/z/3014131-67-1.jpg?t=%E8%8B%A5%E5%A4%9A%E9%A1%B9%E5%BC%8Fx%E7%9A%84%E4%BA%8C%E6%AC%A1%E6%96%B9-3xy%2Bay%E7%9A%84%E4%BA%8C%E6%AC%A1%E6%96%B9%E5%88%86%E8%A7%A3%E4%B8%BA%28x-5y%29%28x-by%29%E5%88%99a.b%E7%9A%84%E5%80%BC%E4%B8%BA)
若多项式x的二次方-3xy+ay的二次方分解为(x-5y)(x-by)则a.b的值为
若多项式x的二次方-3xy+ay的二次方分解为(x-5y)(x-by)则a.b的值为
若多项式x的二次方-3xy+ay的二次方分解为(x-5y)(x-by)则a.b的值为
(x-5y)(x-by)化简得x^2-bxy-5xy+5by^2,则-bxy-5xy=-3xy,即b=-2所以5b=a,即a=-10
(x-5y)(x-by)=x^2-(5+b)xy+5by^2
对应原多项式有5+b=3, a=5b 得a=-10, b=-2
a等于-10
b等于-2