приведите к наименьшему общему знаменателю дроби:
а) 1/8 и 3/4; 9/10 и 1/20; 2/3 и 7/12; 7/15 и 3/5
б)1/2 и 1/3; 2/5 и 3/4; 3/16 и 2/3; 1/5 и 9/25;
в)7/15 и 5/9; 1/6 и 3/10; 5/12 им 7/15; 7/20 и 7/8.
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