分解因式:1,9/4x^2+x+1/9 2,4a(2x-y)^2-36a 3,a^2(x^2-y^2)+b^2(y^2-x^2)

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分解因式:1,9/4x^2+x+1/9 2,4a(2x-y)^2-36a 3,a^2(x^2-y^2)+b^2(y^2-x^2)
分解因式:1,9/4x^2+x+1/9 2,4a(2x-y)^2-36a 3,a^2(x^2-y^2)+b^2(y^2-x^2)

分解因式:1,9/4x^2+x+1/9 2,4a(2x-y)^2-36a 3,a^2(x^2-y^2)+b^2(y^2-x^2)
1,9/4x^2+x+1/9
=(3x/2+1/3)²
2,4a(2x-y)^2-36a
=4a[(2x-y)²-9]
=4a(2x-y+3)(2x-y-3)
3,a^2(x^2-y^2)+b^2(y^2-x^2)
=(x²-y²)(a²-b²)
=(x+y)(x-y)(a+b)(a-b)

1,9/4x^2+x+1/9=(3/2x+1/3)^2
2,4a(2x-y)^2-36a=4a[(2x-y)^2-9]=4a(2x-y+3)(2x-y-3)
3,a^2(x^2-y^2)+b^2(y^2-x^2)
=a^2(x^2-y^2)-b^2(x^2-y^2)
=(a^2-b^2)(x^2-y^2)
=(a+b)(a-b)(x+y)(x-y)