Zauważ że jeśli odejmiesz n + 1 od n to wynikiem zawsze jest -11 - 2 = -150 - 51 = -11000 - 1001 = -1Więc:1 - 2 + 3 - 4 + 5 - 6 + 7 - 8 + ... + 1499 - 1500 = -1 + (-1) + (-1) + (-1) + ... + (-1) = -1 * 1500 / 2 = -1 * 750 = -750
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Zauważ że jeśli odejmiesz n + 1 od n to wynikiem zawsze jest -1
1 - 2 = -1
50 - 51 = -1
1000 - 1001 = -1
Więc:
1 - 2 + 3 - 4 + 5 - 6 + 7 - 8 + ... + 1499 - 1500 = -1 + (-1) + (-1) + (-1) + ... + (-1) = -1 * 1500 / 2 = -1 * 750 = -750