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

Toán Lớp 6: giúp mik với mik đg cần gấp ạ!!!!ɔ: ɔ: 1.Tính : A=200+1999-1998-1997+1996+1995-1994-1993+.........-6-5+4+3-2-1 B=100-98+96-94+.........+16-14+12 2.Tìm n ∈ N để: a,(n+8) ⋮ (n+3) b,(2n+15) ⋮ (n+3) c,(5n+30) ⋮ (n+1) ɔ: ɔ: ɔ: ɔ: ɔ: ɔ: ɔ: { ...

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