(3/7 * 33/40 + 5/6) : 1целая 11/12;
(6цел.7/12 - 3ц. 17/36) * 1/2 - 4ц. 1/3 : 13/20;
( 1ц. 11/24 + 13/36) * 1ц. 11/25 - 8/15 * 9/16;