50c-6500=500
50c=500+6500
50c=7000
c=7000:50
c=140
<em>Ответ</em>: с=140
1км=100000см
1т=10ц
1м=10дм
..............................
................................
18-х=10
х = 8
2+х=7
х=5
х-9=2
х=11
х+8=10
х=2
2/5, 6/50, 9/20, 1/8, 1/25, 96/250, 3/8, 24/25