填空(1/3x+?)(?+2y)=4Y^2-1/9x^2

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填空(1/3x+?)(?+2y)=4Y^2-1/9x^2填空(1/3x+?)(?+2y)=4Y^2-1/9x^2填空(1/3x+?)(?+2y)=4Y^2-1/9x^2解4y²-1/9x&#

填空(1/3x+?)(?+2y)=4Y^2-1/9x^2
填空(1/3x+?)(?+2y)=4Y^2-1/9x^2

填空(1/3x+?)(?+2y)=4Y^2-1/9x^2

4y²-1/9x²
=(2y)²-(1/3x)²
=(2y-1/3x)(2y+1/3x)
填(1/3x+2y)(-1/3x+2y)