528-53-47 800-138-162 470-254-46
=528-(53+47) =800-(138+162) =470-(254+46)
=528-100 =800-300 =470-300
=428 =500 =170
672-36+64 545-167-145 1034+78+320+102
=672+64-36 =545-145-167 =1034+78+102+320
=736-36 =400-167 =1034+(180+320)
=700 =233 =534
325-276-24 25+75-25+75 84×63＋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+24×93-24 300-123-75-77 98×13
=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.