a.2500:(60+(60+5))=2500:(60+65)=2500:125=20
б.(3840-(568+624+401)):3=(3840-1623):3=2217:3=739
в.427-2(52+63)=427-2×115=427-230=197
г.192:(18×4+24×5)=192:(72+120)=192:192=1
a.2500:(60+(60+5))=2500:(60+65)=2500:125=20
б.(3840-(568+624+401)):3=(3840-1623):3=2217:3=739
в.427-2(52+63)=427-2×115=427-230=197
г.192:(18×4+24×5)=192:(72+120)=192:192=1