先化简,再求值[(a+1/4b)^2-(a-1/4b)^2](3a-1/3b)(1/3b+3a)(1/9b^2+9a^2),其中a=1,b=-3
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![先化简,再求值[(a+1/4b)^2-(a-1/4b)^2](3a-1/3b)(1/3b+3a)(1/9b^2+9a^2),其中a=1,b=-3](/uploads/image/z/2770018-34-8.jpg?t=%E5%85%88%E5%8C%96%E7%AE%80%2C%E5%86%8D%E6%B1%82%E5%80%BC%5B%28a%2B1%2F4b%29%5E2-%28a-1%2F4b%29%5E2%5D%283a-1%2F3b%29%281%2F3b%2B3a%29%281%2F9b%5E2%2B9a%5E2%29%2C%E5%85%B6%E4%B8%ADa%3D1%2Cb%3D-3)
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