奥数专题之速算与巧算1
1．计算1.135+3.346+5.557+7.768+9.979=_____.2.计算1.996+19.97+199.8=_____.
3.计算9.8+99.8+999.8+9999.8+99999.8=_____.
4.计算6.11+9.22+8.33+7.44+5.55+4.56+3.67+2.78+1.89=_____.
5.计算1.1+3.3+5.5+7.7+9.9+11.11+13.13+15.15+17.17+19.19=_____.
6.计算2.894.68+4.686.11+4.68=_____.
7.计算17.4837-17.4819+17.4882=_____.
8.计算1.250.322.5=_____.
9.计算754.7+15.925=_____.
10.计算28.6767+3.2286.7+573.40.05=_____.
11.计算172.46.2+27240.38.
12.计算3.17-2.74+4.7+5.29-0.26+6.3=_____.
13.计算(5.25+0.125+5.75)8=_____.
14.计算34.58.23-34.5+2.7734.5=_____.
15.计算6.250.16+2640.0625+5.26.25+0.62520=_____.
16.计算0.035935+0.035+30.035+0.07610.5=_____.
17.计算19.9837-199.81.9+19980.82=_____.
18.计算13.59.9+6.510.1=_____.
19.计算0.1250.250.564=_____.
20.计算11.843-8600.09=_____.
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