Bài 1:Thực hiện phép tính: a,5/7+7/6 b,-5/7.2/11+-5/7.9/11+5/7 c,-4/5:4/3. Bài 2 tìm x biết: a,3/4.x=1/2. b,13/15.x-2/3=1/5 Bài 3 Tính A=2/1.3+2/3.5+2/7.5+..........+2/2017.2019 Mọi người giúp em với nha em cảm ơn

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