Question

巧算以下几道题，要求过程

Answer 1

573-136-64-73+208+182
=(573-73)-(136+64)+(208+182)
=500-200+390
=300+390
=690

127+125+126+123+129+122
=(120+7)+(120+5)+(120+6)+(120+3)+(120+9)+(120+2)
=(120+120+120+120+120+120)+(7+3)+(5+6+9)+2
=120×6+10+20+2
=720+32
=752
127+125+126+123+129+122
=(127+123)+(125+126+129)+122
=250+122+380
=372+380
=752

2663-874-1126+337
=(2663+337)-(874+1126)
=3000-2000
=1000

28534-18534-13967+12467+13017+2983
=(28534-18534)-(13967-12467)+(13017+2983)
=10000-1500+16000
=(10000+16000)-1500
=26000-1500
=24500

274+448-317+326+552-283
=(274+326)+(448+552)-(317+283)
=600+1000-600
=1000

636-112-111+110+109-108-107+106+105-104-103+102+101-100-99+98+97-96-95+94+93-92-91+90+89
=636-(112-110)-(111-109)-(108-106)-(107-105)-(104-102)-(103-101)-(100-98)-(99-97)-(96-94)-(95-93)-(92-90)-(91-89)
=636-2-2-2-2-2-2-2-2-2-2-2-2
=636-(2+2+2+2+2+2+2+2+2+2+2+2)
=636-24
=612