723/532-x=23/28
723-532x=437
723-532x-723=437-723
-532x=-286
x=143/266
А) 4/9 + 6/27 = 12/27 + 6/27 = 18/27 = 2/3
б) 9/10 + 4/5 = 9/10 + 8/10 = 17/10 = 1 7/10
в) 5/6 - 2/3 = 5/6 - 4/6 = 1/6
г) 5/7 - 9/14 = 10/14 - 9/14 = 1/14
<span>певое число - 120; второе - 135,135</span>
6х - 3 - х + 1 = 13
5х = 13 + 3 - 1
5х = 15
х = 3