Найдите сумму n первых членов геометрической прогрессии: 1) 128, 64, 31, ..., n=6;
2) 162, 54, 18, ..., n=5;
3) 2/3, 1/2, 3/8, ..., n=5;
4) 3/4, 1/2, 1/3, ..., n=4.
2) 162, 54, 18, ..., n=5;
3) 2/3, 1/2, 3/8, ..., n=5;
4) 3/4, 1/2, 1/3, ..., n=4.
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