October 2018 2 19 Report
Tentukan hasilnya tanpa menghitung satu persatu. Hrus memakai cara!!!
a. 1+3+5+7+9+....+99 = …
b. 1-2+3-4+5-6+7-8+....-100 = …
c. -100-99-98-…-2-1-0+1+2+…+48+49+50 =…

Mohon d jawab secepatnya!!! Makasih

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