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Bài 1:Rút gọn
$\dfrac{5^2.6^{11}+16^2+6^2.12^6.15^2}{2.6^{12}.10^4-81^2.960^2}$
~Chú ý đề~
$\dfrac{5^2.6^{11}+16^2+6^2.12^6.15^2}{2.6^{12}.10^4-81^2.960^2}$
~Chú ý đề~
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