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简便运算(三)例1 计算:(1)37 (2) 27 =()37 =(26+1) =37- =15+ = =练习1 8 =()8 =8- =例2 73 = = =练习2 64 = = =例3 27+41 = = =50 =30练习3 39+27 = = = =30例4 + =练习4 + = =1 =例5 计算:(1)16641 (2) 19981998 = =1998 =4+ =1998 = =练习5 5417 = = =课堂作业:1、126 2、41+51 = = =10+ =30+1+40+1 = =723、 5+5+10 4、+3 = = = = =5 =家庭作业:1、 1999 2、 57 = = = = = =3、 35+17 4、79+50+ = = = = =20 =455、238238 = = =