0=-0.5х-5.5 х= -5.5\0.5=-11
(12,7+9,2+18,4+15,7+7,5):5=63,5:5=12,7
2ц 7/9 * 3ц 3/5=25/9 * 18/5=10
3ц 7/9 * 1ц 1/7=34/9*8/7=272\63=4ц 20/63
5ц 1/6 * 3ц 1/7=31/6 * 22/7=682/42=16ц 5/21
7ц 1/ 3 * 2ц 2/11=22/3 * 24/11=48/3=16
5/9 + 3/4 = 20/36 + 27/36 = 47/36 = 1ц. 17/36