简便算法.

528-53-47 800-138-162470-254-46
=528-(53+47)=800-(138+162) =470-(254+46)
=528-100=800-300 =470-300
=428=500 =170
672-36+64 545-167-1451034+78+320+102
=672+64-36=545-145-167 =1034+78+102+320
=736-36 =400-167 =1034+(180+320)
=700=233 =534
325-276-2425+75-25+7584×63＋84×37
=325-(276+24) =25-25+75+75 =84(63+37)
=325-300=75+75 =84*100
=25 =150 =8400
127+123+184+240 8×（125+25）487-187-139-61
=127+123+240+184=8×125+8×25=487-(139+61+187)
=490-184=1000+200=487-387
=306=1200=100
24×8+24×93-24 300-123-75-7798×13
=24(8+93-1) =300-(123+77+75) =(100-2)×13
=24×100 =300-275 =1300-26
=2400 =25=1274
只有我这么无聊的人才做你这题.