364-(364-111)=364-364+111=111
249-(75-51)=(249+51)-75=300-75=225
C1: * 364 - (364 - 111)
= 364 - 364 + 111
= 111
* 249 - (75 - 51)
= 249 - 75 + 51
= (249 + 51) - 75
= 300 - 75
= 225
C2: * 364 - (364 - 111)
= 364 - 253
= 111
* 249 - (75 - 51)
= 249 - 24
= 225