六年级数学脱式计算题练习(带答案)-查字典问答网
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  六年级数学脱式计算题练习(带答案)

  六年级数学脱式计算题练习(带答案)

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2019-05-08 06:57
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  1.(1/69+2/71)乘23+25除以71

  =1/69*23+2/71*23+25/71

  =1/3+(46/71+25/71)

  =1/3+1

  =4/3

  2.(1+1/2)乘(1-1/2)乘(1+1/3)乘(1-1/3)乘.乘(1+1/9)乘(1-1/9)

  =3/2*1/2*4/3*2/3...*10/9*8/9

  =1/2*10/9(中间的都约去了)

  =5/9

  3.1/2乘3+1/3乘4+.+1/19乘20

  =1/2-1/3+1/3-1/4+...+1/19-1/20

  =1/2-1/20

  =9/20

  4.1/27+505/2727+131313/272727

  =1/27+5*101/(27*101)+13*10101/(27*10101)

  =1/27+5/27+13/27

  =19/27

  5.100-98+96-94+.+4-2

  =(100-98)+(96-94)+...(4-2)

  =2+2+...+2(共有25个)

  =2*25

  =50

  五十二又二十五分之十一×79.45+159×47.56+七十九又二十分之十一×52.44

  =52.44×79.45+159×47.56+79.55×52.44

  =52.44×(79.45+79.55)+159×47.56

  =52.44×159+159×47.56

  =159×(52.44+47.56)

  =159×100

  =15900

  3)2002+2001-2000-1999+1998+1997-1996-1995+……+2+1

  =(2002-2000)+(2001-1999)+(1998-1996)+(1997-1995)+……+(6-4)+(5-3)+2+1

  =2+2+2+2+……+2+2(从3-2002共2000个数,所以有1000个2)+2+1

  =1000×2+2+1

  =2003

  4,5两题均用到一个转换式1/(A×B)=1/(B-A)×(1/A-1/B)

  如1/15=1/(3×5)=1/(5-3)×(1/3-1/5)=1/2×(2/15)=1/15可验证一下

  4)(1×2分之一)+(2×3分之一)+(3×4分之一)+……+(10×11分之一)

  =1/(1×2)+1/(2×3)+1/(3×4)+……+1/(10×11)

  =(1-1/2)+(1/2-1/3)+(1/3-1/4)+……+(1/10-1/11)

  =1-1/11

  =10/11

  5)三分之一+十五分之一+三十五分之一+六十三分之一+九十九分之一

  =1/(1×3)+1/(3×5)+1/(5×7)+1/(7×9)+1/(9×11)

  =1/2×(1-1/3)+1/2×(1/3-1/5)+1/2×(1/5-1/7)+1/2×(1/7-1/9)+1/2×(1/9-1/11)

  =1/2×(1-1/3+1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11)

  =1/2×(1-1/11)

  =1/2×10/11

  =5/11

  6)一又二分之一-六分之五+十二分之七-二十分之九+三十分之十一-四十二分之十三+五十六分之十五

  (根据提示,1又1/2=1+1/2,+1/2+1/3=5/6……)

  =(1+1/2)-(1/2+1/3)+(1/3+1/4)-(1/4+1/5)+(1/5+1/6)-(1/6+1/7)+(1/7+1/8)

  =1+1/2-1/2-1/3+1/3+1/4-1/4-1/5+1/5+1/6-1/6-1/7+1/7+1/8

  =1+1/8

  =9/82010-2-820:141.125*3+125*5+25*3+25

  2.9999*3+101*11*(101-92)

  3.(23/4-3/4)*(3*6+2)

  4.3/7×49/9-4/3

  5.8/9×15/36+1/27

  6.12×5/6–2/9×3

  7.8×5/4+1/4

  8.6÷3/8–3/8÷6

  9.4/7×5/9+3/7×5/9

  10.5/2-(3/2+4/5)

  11.7/8+(1/8+1/9)

  12.9×5/6+5/6

  13.3/4×8/9-1/3

  14.7×5/49+3/14

  15.6×(1/2+2/3)

  16.8×4/5+8×11/5

  17.31×5/6–5/6

  18.9/7-(2/7–10/21)

  19.5/9×18–14×2/7

  20.4/5×25/16+2/3×3/4

  21.14×8/7–5/6×12/15

  22.17/32–3/4×9/24

  23.3×2/9+1/3

  24.5/7×3/25+3/7

  25.3/14××2/3+1/6

  26.1/5×2/3+5/6

  27.9/22+1/11÷1/2

  28.5/3×11/5+4/3

  29.45×2/3+1/3×15

  30.7/19+12/19×5/6

  31.1/4+3/4÷2/3

  32.8/7×21/16+1/2

  33.101×1/5–1/5×21

  34.50+160÷40

  35.120-144÷18+35

  36.347+45×2-4160÷52

  37(58+37)÷(64-9×5)

  38.95÷(64-45)

  39.178-145÷5×6+42

  40.812-700÷(9+31×11)

  41.85+14×(14+208÷26)

2019-05-08 07:01:09

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