因式分解:4mn+1/9-4m^2-n^2
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因式分解:4mn+1/9-4m^2-n^2
4mn+1/9-4m^2-n^2
=1/9-4m²+4mn-n²
=(1/3)²-(4m²-4mn+n²)
=(1/3)²-(2m-n)²
=(1/3+2m-n)(1/3-2m+n)
=1/9-4m²+4mn-n²
=(1/3)²-(4m²-4mn+n²)
=(1/3)²-(2m-n)²
=(1/3+2m-n)(1/3-2m+n)