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Misal : 1+3+5 itu berapa pangkat 2? = cara hitung = (bil. awal + bil akhir) : 2
= ( 1 + 5 ) : 2
= 6 : 2
Bener, kan?? ^o^
= 3. Jadi, 1+3+5 = 3pangkat 2.
Ditanya = 1+3+5+7+...+89 = n². n = ?
n = (1+89) : 2
n = 90 : 2
n = 45
Jadi, 1+3+5+7+...+89 = n² = 45²
Semoga membantuu °ω° ^_~