Question

Tlong bantu jawab yang no 7.. Thanks:)

Answer 1

Verified answer

A•
2 + 4 + ... + 98 + 100 ada 50 suku
= (2 + 98) + (4 + 96) + ... + (48 + 52) + 50 + 100
= (100 × 24) + 50 + 100
= 2550

B•
(-1 + 2) + (-3 + 4) + ... + (-99 + 100) ada 100 suku
= (1) + (1) + ... + (1) + (1)
= (1) × 100/2
= 50

C•
-100 - 99 - 98 - ... - 1 + 0 + 1 + 2 + ... + 98 + 99

= -100 + (-99 + 99) + (-98 + 98) + ... + 0
= -100 + 0 + .. + 0
= -100