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tuyetnghi2004
2 năm trước
Giúp mình với, đừng làm bừa và sai nhé!!! Bạn nào không biết làm câu b thì bỏ nhé còn phải làm câu a đó Tính (hợp lý) $A=\dfrac{6}{7}.\dfrac{8}{13}+\dfrac{6}{13}.\dfrac{9}{7}-\dfrac{3}{13}.\dfrac{6}{7}$ $B=\dfrac{2^2}{1.3}.\dfrac{3^2}{2.4}.\dfrac{4^2}{3.5}....\dfrac{50^2}{49.51}$
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