化简.9a^2-4b^2.a^2-1/25b^2.x^2+12x+36.4x^2-4x+1...
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![化简.9a^2-4b^2.a^2-1/25b^2.x^2+12x+36.4x^2-4x+1...](/uploads/image/z/11650290-42-0.jpg?t=%E5%8C%96%E7%AE%80.9a%5E2-4b%5E2.a%5E2-1%2F25b%5E2.x%5E2%2B12x%2B36.4x%5E2-4x%2B1...)
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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