25 х 2 = 50
450:50 =9
300-9=291
70х6:3 = 140
б)291-140=1514*(30*8)-9*8:12-(100-8*8)=4*240-72:12-(100-64)=960-6-36=918
4896/18=272
4698/18=261
4590/18=255
4392/18=244
4194/18=233