1、4(x+y)^2+25-20(x+y)=2.(a+b)^2-4(a+b-1)=3.(a^2+4b^2)^2-16a^2b^2=4.(1-1/2^2)*(1-1/3^2)*(1-1/4^2)*...*(1-1/2013^2)=Thank you very much!
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![1、4(x+y)^2+25-20(x+y)=2.(a+b)^2-4(a+b-1)=3.(a^2+4b^2)^2-16a^2b^2=4.(1-1/2^2)*(1-1/3^2)*(1-1/4^2)*...*(1-1/2013^2)=Thank you very much!](/uploads/image/z/11438536-40-6.jpg?t=1%E3%80%814%28x%2By%29%5E2%2B25-20%28x%2By%29%3D2.%28a%2Bb%29%5E2-4%28a%2Bb-1%29%3D3.%28a%5E2%2B4b%5E2%29%5E2-16a%5E2b%5E2%3D4.%281-1%2F2%5E2%29%2A%281-1%2F3%5E2%29%2A%281-1%2F4%5E2%29%2A...%2A%281-1%2F2013%5E2%29%3DThank+you+very+much%21)
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