已知(x+my)(x+ny)=x²+2xy-8y²,求(m+n)mn的值 要过已知(x+my)(x+ny)=x²+2xy-8y²,求(m+n)mn的值
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![已知(x+my)(x+ny)=x²+2xy-8y²,求(m+n)mn的值 要过已知(x+my)(x+ny)=x²+2xy-8y²,求(m+n)mn的值](/uploads/image/z/9322540-52-0.jpg?t=%E5%B7%B2%E7%9F%A5%EF%BC%88x%EF%BC%8Bmy%EF%BC%89%EF%BC%88x%EF%BC%8Bny%EF%BC%89%EF%BC%9Dx%26%23178%3B%EF%BC%8B2xy-8y%26%23178%3B%2C%E6%B1%82%EF%BC%88m%EF%BC%8Bn%EF%BC%89mn%E7%9A%84%E5%80%BC+%E8%A6%81%E8%BF%87%E5%B7%B2%E7%9F%A5%EF%BC%88x%EF%BC%8Bmy%EF%BC%89%EF%BC%88x%EF%BC%8Bny%EF%BC%89%EF%BC%9Dx%26%23178%3B%EF%BC%8B2xy-8y%26%23178%3B%2C%E6%B1%82%EF%BC%88m%EF%BC%8Bn%EF%BC%89mn%E7%9A%84%E5%80%BC)
已知(x+my)(x+ny)=x²+2xy-8y²,求(m+n)mn的值 要过已知(x+my)(x+ny)=x²+2xy-8y²,求(m+n)mn的值
已知(x+my)(x+ny)=x²+2xy-8y²,求(m+n)mn的值 要过
已知(x+my)(x+ny)=x²+2xy-8y²,求(m+n)mn的值
已知(x+my)(x+ny)=x²+2xy-8y²,求(m+n)mn的值 要过已知(x+my)(x+ny)=x²+2xy-8y²,求(m+n)mn的值
已知(x+my)(x+ny)=,
x^2+(m+n)xy+mny^2=x²+2xy-8y²
m+n=2,mn=-8
(m+n)mn=-16
条件不够