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1、简便计算练习题(1)165+61+139+235 (2)444-147-12(3)25504 (4)10122-22(5)842125 (6)1252548(7)1209-551-431-18 (8)5636+5633+563(9)2224+44498 (10)30(1/35+2/30)35(11)359+148+441+44+452+456参考答案:(1)165+61+139+235 =165+235+61+139 =400+200 =600 (2)444-147-12=444-(147+12)=444-300 =144(3)25504 =25450 =10050 =5000 (4)1012
2、2-22 =10122-221 =(101-1)22=2200(5)842125 =812542 =100042 =42000 (6)1252548=12582541 =10001001=100000(7)1209-551-431-18 =1209-(551+431+18) =1209-1000 =209 (8)5636+5633+563=563(6+3+1)=56310=56300(9)2224+44498 =4442+44498 =444(2+98) =444100 =44400(10)30(1/35+2/30)35=3035(1/35+2/30)=3035/35+30352/30=30+65=100(11)359+148+441+44+452+456=359+441+(148+452)+(44+456)=800+600+500=1900