Найдите сумму вычисляя наиболее удобным способом:
1)1,1 + 2,2 + 3,3 + ... + 9,9;           2)0,15 + 0,25 + 0,35 + ... + 0,85;
3)0,125 + 0,25 + 0,375 + 0,5 + 0,625 + 0,75 + 0,875.
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