(1)37+22+63+45=(37+63)+(22+45)=100+67=167;(2)53.24-47.5-2.5=53.24-(47.5+2.5)=53.24-50=3.24;(3)17×43-43×7=(17-7)×43=10×43=430;(4)72×125=9×8×125=9×(8×125)=9×1000=9000;(5)4900÷25÷4=4900÷(25×4)=4900÷100=49;(6)(100+4)×25=100×25+4×25=2500+100=2600.
47十453X37=47十16761=16808
47+37x453
=47+(37x400+37x50+37x3)
=47+(14800+1850+111)
=47+(16650+111)
=47+16761
=16808
47+37*453
=47+37*(500-47)
=47+37*500-37*47
=37*500-47(37-1)
=37*500-47*36
=
=[(50-3)十(40-3)]X(450+3)=87X453=