分解因式-1/4x^2+9y^2

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分解因式-1/4x^2+9y^2分解因式-1/4x^2+9y^2分解因式-1/4x^2+9y^2-1/4x^2+9y^2=9y^2-1/4x^2=(3y+1/2x)(3y-1/2x)-1/4x^2+9

分解因式-1/4x^2+9y^2
分解因式-1/4x^2+9y^2

分解因式-1/4x^2+9y^2
-1/4x^2+9y^2
=9y^2-1/4x^2
=(3y+1/2x)(3y-1/2x)

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

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-1/4x^2+9y^2
= -( x²-36y²) /4
= -(x-6y) (x+6y) /4
= (6y-x)(6y+x) /4