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1、17,12,1712=1710 + 172=170 + 34=204,小丁丁：,1712=173 4=51 4=204,小巧：,1712=2012 - 312=240 - 36=204,小亚：,1712=812 + 912=96+108=204,小胖：,17,13,17,13,1713=1710 + 173 =170+51=221,1710,10,3,173,17,13,10,7,1713=1013 + 713 =130+91=221,1013,713,17,13,20,7,1713=1720 - 177=340 - 119=221,1720,177,17,13,20,3,1713= 2013
2、 - 313= 260 - 39 = 221,2013,3 13,4337=4330 + 437=1290 + 301=1591,用小丁丁的方法试一试：,4337,3129=3120 + 319=620 + 279=899,3129, 1729 =1720 + 17( ), 4773 =47( ) +47( ), 5367 = 53 53 =3180+371 =3551,填空：,9,60+,7,25,25,1,24,2425=2525 - 125=625 - 25=600,已知:25 25=625,25,25,1,2625=2525 + 125=625 + 25=650,已知:25 25=625,25,25,1,24,2426=2525 - 125+124 =625 - 25 + 24=600+24=624,1,已知:25 25=625,53=530 + 53=583,34=340 + 34=374,有趣的计算,53,11,11,5,3,两头一拉，,8,中间相加。,62117111,谢谢!,
