упростите выражение, используя законы умножения:
а) 5/12 * 3м * 2/5;
б) 5/9Х * 3/7 * 14/15;
в) 1 5/7а * 1 3/4 * 5 1/3;
г) 2 3/8 * 1 16/19м * 2 2/7.
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