Toán Lớp 6: B = - 1 - 2 - 3 - ... - 201 - 202 help, Up cho ctrlhn

Giải đáp: b = - ( 1+2+3 +....+ 202) = - 203. 101 = -20503 .

B = - 1 - 2 - 3 - ... - 201 - 202 = - (1 + 2 + 3 +....+ 201 + 202) = - [(202 + 1) . 202 : 2] = -20503

Toán Lớp 6: B = - 1 - 2 - 3 - ... - 201

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