1.已知lg2=a,lg3=b,用a,b表示log(15)12.2.已知lgX+lgY=2lg(x-2y),求log(√2)x/y的值3.不利用计算机求lg^3(2)+lg^3(5)+3lg2*lg5的值
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![1.已知lg2=a,lg3=b,用a,b表示log(15)12.2.已知lgX+lgY=2lg(x-2y),求log(√2)x/y的值3.不利用计算机求lg^3(2)+lg^3(5)+3lg2*lg5的值](/uploads/image/z/6980025-57-5.jpg?t=1.%E5%B7%B2%E7%9F%A5lg2%3Da%2Clg3%3Db%2C%E7%94%A8a%2Cb%E8%A1%A8%E7%A4%BAlog%2815%2912.2.%E5%B7%B2%E7%9F%A5lgX%2BlgY%3D2lg%28x-2y%29%2C%E6%B1%82log%28%E2%88%9A2%29x%2Fy%E7%9A%84%E5%80%BC3.%E4%B8%8D%E5%88%A9%E7%94%A8%E8%AE%A1%E7%AE%97%E6%9C%BA%E6%B1%82lg%5E3%282%29%2Blg%5E3%285%29%2B3lg2%2Alg5%E7%9A%84%E5%80%BC)
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