Toán Lớp 6: 1 + 2 – 3 – 4 + 5+ 6 – …+ 101+102 – 103-104
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Toán Lớp 6: 1 + 2 – 3 – 4 + 5+ 6 – …+ 101+102 – 103-104
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1 + 2 – 3 – 4 + 5 + 6 – ….. + 101 + 102 – 103 – 104
= (1 – 3) + (2 – 4) + …. + (101 – 103) + (102 – 104)
= (-2) + (-2) + …. + (-2) + (-2) ( 52 số -2 )
= (-2) . 52
= -104