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

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