4,9+5,9х-3,1х+5,6=10,5+2,8х
2.45m-21.56=4.41
2.45m=4.41+21.56
2.45m=25.97
m=25.97:2.45
m=10.6
7.54k-3.6k=5.91
3.94k=5.91
k=5.91:3.9
k=1.5
25/7725
77/25=3
3*25=75
77-75=2
22/25=0
225/25=9
9*25=225
225-225=0
=300
7*а-5*а+2*а = а*(7-5+2)= 4*а
296*12+352*24= 12*(296+352*2) =12*(296+704) =12*1000=12000