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love_love_love1995


Giải hpt
[TEX]\left {\frac{A^x_y }{P_{x-1}}+C^{y-x}_y=126\\P_{x+1}=720[/TEX]
[TEX]\left {\frac{A^x_y }{P_{x-1}}+C^{y-x}_y=126\\P_{x+1}=720[/TEX]
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