Cho A=\(\dfrac{50}{111}\)+\(\dfrac{50}{112}\)+\(\dfrac{50}{113}+\dfrac{50}{114}\)
CMR : 1
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Toán lớp 6
Cho A=\(\dfrac{50}{111}\)+\(\dfrac{50}{112}\)+\(\dfrac{50}{113}+\dfrac{50}{114}\)
CMR : 1
