7+8+9=8x3 11 12 13 14 + 15 = 13 x 5 Yukarıda verilen toplama işlemine göre 82 83 84 + ... + 92 sayılarının toplamının sonucu aşağıdaki çarpma iş- lemlerinden hangisinin sonucuna eşittir? A) 86 x 10 B) 87 x 11 C) 87 x 10 D) 88 x 12
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