Tìm n ∈ ℕ*
1) 1 + 2 + 3 + -. + n = 4950
2) 2 + 4 + 6 + 8 + -. + ( 2n + 2 ) = 4950
Loga
Toán lớp 6
Tìm n ∈ ℕ*
1) 1 + 2 + 3 + -. + n = 4950
2) 2 + 4 + 6 + 8 + -. + ( 2n + 2 ) = 4950
