сравни
420:6...4200:60
150*10...15*100
36:9...360:90
5600:800...56:8
240*30...300*24
7200:90...7200:80

420:6=4200:60......70=70150*10=15*100....1500=150036:9=360:90.....4=45600:800=56:8...............7=7240*30=300*24.....7200=72007200:90<7200:80..........80 <90