(1 + 1) - (2 + 2) - (3 - 3) - 4 + 4 - 5 + 5 - 6 + 6 = - 2
tích bạn nha
giai :
(1 + 1) - (2 + 2) - (3 - 3) - 4 + 4 - 5 + 5 - 6 + 6 = - 2
tích bạn nha !!!
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va dap so = 2