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1、简便计算练习题(1)118+85+115+282 (2)428-128-12(3)251394 (4)10132-32(5)823125 (6)12525288(7)1193-131-313-56 (8)4923+4926+492(9)8885+55592 (10)6(1/47+2/6)47(11)469+544+431+63+256+737参考答案:(1)118+85+115+282 =118+282+85+115 =400+200 =600 (2)428-128-12=428-(128+12)=428-300 =128(3)251394 =254139 =100139 =13900 (4)
2、10132-32 =10132-321 =(101-1)32=3200(5)823125 =812523 =100023 =23000 (6)12525288=12582547 =10001007=700000(7)1193-131-313-56 =1193-(131+313+56) =1193-500 =693 (8)4923+4926+492=492(3+6+1)=49210=49200(9)8885+55592 =5558+55592 =555(8+92) =555100 =55500(10)6(1/47+2/6)47=647(1/47+2/6)=647/47+6472/6=6+94=100(11)469+544+431+63+256+737=469+431+(544+256)+(63+737)=900+800+800=2500