化简.9a^2-4b^2.a^2-1/25b^2.x^2+12x+36.4x^2-4x+1...

化简.9a^2-4b^2.a^2-1/25b^2.x^2+12x+36.4x^2-4x+1...
化简.9a^2-4b^2.a^2-1/25b^2.x^2+12x+36.4x^2-4x+1...

化简.9a^2-4b^2.a^2-1/25b^2.x^2+12x+36.4x^2-4x+1...
①9a^2-4b^2=(3a+2b)(3a-2b)
②a^2-1/25b^2=(a-1)(a+1)/(5b)^2
③x^2+12x+36=(x+6)^2
④4x^2-4x+1=(2x-1)^2
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