五年级简便计算奥数题.docx
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奥数班摸底测试卷
班级姓名.
一、简便计算下列各题:
(1~10小题每小题5分,11~15小题每小题10分)
1.2.5×1.25.×3.2
2.0.125×0.25×0.5×64
3.320÷1.25÷8
4.2.4×7.6+7.6×6.5+7.6+0.76
5.3.74×5.8+62.6×0.58
6.2005×0.375-0.375×1949+3.75×2.4
7.2016+201.6+20.16+2.016
8.22.8×98+45.6
9.5.2×1111+6666×0.8
10.999.9×0.28-0.6666×370
11.0.27÷0.25
12.1.25×3.14+125×0.0257+1250×0.00229
13.18.3×0.25+5.3÷0.4-3.13×2.5
14.3.6×31.4+43.9×6.4(提示:
43.9=31.4+12.5)
15.75×4.7+15.9×25
二、附加题
1.计算:
20.05×39+200.5×4.1+40×10.025(提示:
40×10025=2×20×10.025=20×20.05)
2.计算:
1.1+3.3+5.5+7.7+9.9+11.11+13.13+15.15+17.17+19.19
3.计算:
(1+0.12+0.23)×(0.12+0.23+0.34)-(1+0.12+0.23+0.34)×(0.12+0.23)
3.计算:
(2+1.23+2.34)×(1.23+2.34+3.45)-(1.23+2.34)×(2+1.23+2.34+3.45)
(提示:
令M=1.23+2.34,N=1.23+2.34+3.45,将原式化简为M,N的表达式)
4.比较下面两个乘积A,B的大小
A=9.8732×7.2345
B=9.8733×7.2344