Question

Jawab nomor 2 a, b, c sama caranya plisss #helpme

Answer 1

Poin a:
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Misalkan A = 1 + 3 + 5 + 7 + ... + 99, maka

A = 1 + 3 + 5 + 7 + ... + 93 + 95 + 97 + 99
A = 99 + 97 + 95 + 93 + .... + 7 + 5 + 3 + 1
----------------------------------------------------------- +
2A = 100 + 100 + 100 + 100 + ... + 100 + 100 + 100 + 100 
2A = 100 x 99
A = 100 x 99 / 2
A = 4.950

Jadi, 1 + 3 + 5 + 7 + ... + 93 + 95 + 97 + 99 = 4.950.


Poin b:
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1 - 2 + 3 - 4 + 5 - 6 + 7 - 8 + ... - 100
= (1 - 2) + (3 - 4) + (5 - 6) + (7 - 8) + ... + (99 - 100)
= (-1) + (-1) + (-1) + (-1) + (-1) + ... + (-1)
= (-1) x 50
= -50

Poin c:
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-100 - 99 - 98 - ... - 2 - 1 - 0 + 1 + 2 + ... + 48 + 49 + 50
= -100 - 99 - 98 - ... - 50 - 49 - 48 - ... - 2 - 1 - 0 + 1 + 2 + ... + 48 + 49 + 50 
= -100 - 99 - 98 - ... (-50 - 49 - 48 - ... - 2 - 1 - 0 + 1 + 2 + ... + 48 + 49 + 50)
= -100 - 99 - 98 - 0
= -297
 
Semoga membantu :)