<span>2 3 5 7 11 13 17 19 23 29
31 37 41 43 47 53 59 61 67 71
73 79 83 89 97 101</span>
3,6х+2,8-0,4х=15,6
3,2х=12,8
х=12,8:3,2
х=4
(2 3/7)*х=5 2/3
х=17/3:17/7
х=7/3=<em>2 1/3</em>
×*30=1000-730
×*30=270
×=270:30
×=9
____________
9*30=1000-730
270=270
46 сантиметров 5 милиметров