1) 0,6,12,18,24,30,36,42 и т.д
2) 0,15,30,45,60,75,90,105 и т.д
3)10, 12,14,16,18,20,22......
3 1/20=3,05
2 3/50=2,06
4 8/25=4,32
7 11/20=7,55
12 4/25=12,16
862-x=284
х= 862-284
х=578
х*320=960
х=960/320
х=3
38/7 - (5/2 + 4/3): (1/6)=
=38/7 - (15/6 - 8/6):(1/6)=
=38/7 - (23*6)/6=
38/7 - 23 = (38 - 23*7)/7 = (38 - 161)/7 = - 123/7 = - 17 4/7