October 2018 1 91 Report
Tentukan hasil dari (tanpa menghitung satu persatu)
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

tolong pake cara ya.... mksih
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