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0
2024-05-16 22:27:47
đi ra khỏi lớp không tắt điện,quạt
2024-04-22 21:30:19
a) \(\dfrac{5}{17}-\dfrac{25}{31}+\dfrac{12}{17}+\dfrac{-6}{31}=\left(\dfrac{5}{17}+\dfrac{12}{17}\right)-\left(\dfrac{25}{31}+\dfrac{6}{31}\right)=1-1=0\)
b)