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Tính tổng: a,1+ (-2) + 3 + (-4) +... + 19 + (-20). b,1 - 2 + 3 - 4 +... + 99 - 100. c, 2 - 4 + 6 - 8 +...+ 48 - 50. d, -1 - 3 + 5 - 7 -... + 97 - 98. e, 1+ 2 - 3 - 4 +... + 97 + 98 - 99. Mọi người ơi giúp mình nhé 😭😭
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