n/m=2,则(m²+3mn-n²)/(m²+mn+2n²)的值是
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![n/m=2,则(m²+3mn-n²)/(m²+mn+2n²)的值是](/uploads/image/z/1124129-65-9.jpg?t=n%2Fm%3D2%2C%E5%88%99%EF%BC%88m%26%23178%3B%2B3mn-n%26%23178%3B%EF%BC%89%2F%EF%BC%88m%26%23178%3B%2Bmn%2B2n%26%23178%3B%EF%BC%89%E7%9A%84%E5%80%BC%E6%98%AF)
n/m=2,则(m²+3mn-n²)/(m²+mn+2n²)的值是
n/m=2,则(m²+3mn-n²)/(m²+mn+2n²)的值是
n/m=2,则(m²+3mn-n²)/(m²+mn+2n²)的值是
即n=2m
所以n²=4m²
mn=2m²
所以原式=(m²+6m²-4m²)/(m²+2m²+8m²)
=3m²/11m²
=3/11
n/m=2,n=2m
(m²+3mn-n²)/(m²+mn+2n²)
=3m²/11m²
]=3/11