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1、简便运算(三)例 1 计算:(1)4445 37 (2)271526 =(451-1)37 =(26+1)2615 =37-4537 =15+2615 =45836 =261515 练习 1 1415 8 =(151-1)8 =8-158 =1577 例 2 73115 18 =81151672)(=1529 =1529 练习 2 64117 19 =91171863)(=1727 =1727 例 3 15 27+35 41 =4153953 =)(41953 =5350 =30 练习 3 14 39+34 27 =27431343 =)(271343 =4043 =30 例 4 56 113
2、+59 213+518 613 =)(1869261135=1813135=185 练习 4 117 49+517 19 =)(9594171 =1711 =171 例 5 计算:(1)166120 41 (2)1998199819981999 =4112041164)(=19981999199819991998 =4+201 =1998)(1199919981999 =2014 =20001999 练习 5 5425 17 =17151751)(=1713 =1713 课堂作业:1、225 126 2、4113 34+5114 45 =)1125(252 =544550433440)()(=
3、10+252 =30+1+40+1 =25210 =72 3、18 5+58 5+18 10 4、15738+115 716+115 312 =)(1025581 =)(2116183157 =4081 =1615157 =5 =167 家庭作业:1、19971998 1999 2、17 5716 =)(1199819981997 =)(675671 =199819971997 =618 =199819971997 =618 3、16 35+56 17 4、59 791617+5019+19 517 =)(17765 =)(1711017167995 =2465 =8195 =20 =45 5、238238238239 =239238239238238 =)(1239238239238 =240239