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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: Bài 9:tính tổng các phân số sau: 2) 2/1.3+2/1.5+2/5.7+...+2/2003.2005 4) 3/4.7+3/7.10+3/10.13+...+3/97.100 Bài 11:Tìm x, biết 1) 2 và 2/9 -x =1/12+1/20+1/30+1/42+1/56+1/72 2) (1/2.3+1/3.4+...+1/49.50) . x=1 { "@context": "https://schema.org", ...

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