-1/4m^2+1/3mn-1/9n^2
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-1/4m^2+1/3mn-1/9n^2-1/4m^2+1/3mn-1/9n^2-1/4m^2+1/3mn-1/9n^2-(1/2m-1/3n)m²+1/3mn+(1/9n²-3/
-1/4m^2+1/3mn-1/9n^2
-1/4m^2+1/3mn-1/9n^2
-1/4m^2+1/3mn-1/9n^2
-(1/2m-1/3n)
m²+1/3mn+(1/9n²-3/4m²)=(1/2m+1/3n)²
x²+6ax+9a
=(x+3a)²
(x-2a)²-a(2a-x)
=(x-2a)(x-2a+a)
=(x-2a)(x-a)
(2x+6)²=4x²+24x+36
所以m=24
望采纳
-1/4m^2+1/3mn-1/9n^2
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