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1、简便计算练习题(1)156+18+182+244 (2)456-128-12(3)25334 (4)10184-84(5)851125 (6)12525288(7)1082-321-411-68 (8)2665+2664+266(9)1119+33397 (10)78(1/11+2/78)11(11)254+725+346+41+475+859参考答案:(1)156+18+182+244 =156+244+18+182 =400+200 =600 (2)456-128-12=456-(128+12)=456-300 =156(3)25334 =25433 =10033 =3300 (4)101
2、84-84 =10184-841 =(101-1)84=8400(5)851125 =812551 =100051 =51000 (6)12525288=12582547 =10001007=700000(7)1082-321-411-68 =1082-(321+411+68) =1082-800 =282 (8)2665+2664+266=266(5+4+1)=26610=26600(9)1119+33397 =3333+33397 =333(3+97) =333100 =33300(10)78(1/11+2/78)11=7811(1/11+2/78)=7811/11+78112/78=78+22=100(11)254+725+346+41+475+859=254+346+(725+475)+(41+859)=600+1200+900=2700