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A very simple question 1+2+3+4+5+6+7+8+... +98+99=? What's the formula? What is the formula for finding the number?
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Why does the second step of the simple formula of this question add 1? 35×68+68+68×64 =68×(35+1+64) =68×100 =6800
35×68+68+68×64
=35×68+68×1+68×64
=68×(35+1+64)
=68×100
=6800
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