已知y=2z,x=3z.求(2xy+3yz+6x)/(x^2+5y^2+7x^2)要过程.
參考答案:(2xy+3yz+6xz)/(x^2+5y^2+7x^2)
=(12z^2+6z^2+18z^2)/(9z^2+20z^2+63z^2)
=36z^2/92z^2
=9/23
已知y=2z,x=3z.求(2xy+3yz+6x)/(x^2+5y^2+7x^2)要过程.
參考答案:(2xy+3yz+6xz)/(x^2+5y^2+7x^2)
=(12z^2+6z^2+18z^2)/(9z^2+20z^2+63z^2)
=36z^2/92z^2
=9/23