30道简便运算 20道列式计算 50道四则混和运算

7个回答

  • 简便运算

    8888÷0.125=

    ★1.83与x的5倍的积.

    ★2.x的2倍与28的差.

    ★3.5个125连加.

    ★★4.a与b的差的3.5倍.

    ★★5.用c去乘a与b的积.

    ★★8.x的25%比它的20%多0.2.

    ★★★9.三个连续的奇数,中间一个是n,其他两个是多少.

    ★★10.求a、b、c三个数的平均数.

    二、选择.

    A.0.5 B.1.02

    ★★3.20与3.1的差的6倍,再除以0.7,商是多少?正确的列式是( ).

    A.20-3.1×6÷0.7

    B.(20-3.1)×6÷0.7

    C.(20-3.1×6)÷0.7

    D.20-3.1×(6÷0.7)

    ★★4.43减去2.01与2.2的和,所得的差再除以2,结果是( ).

    A.2.245 B.0.045

    C.2.195 D.22.2

    三、判断.

    ( )

    四、列式计算.

    ★★1.两数之和是341,一个加数是0.99,另一个加数是多少?

    ★★2.除数是0.78,被除数是0.39,商是多少?

    ★★4.比2.4多0.8的数的一半是多少?

    ★★5.甲数是30,它比乙数少30,乙数是甲数的几倍?

    ★★6.比15.6的3倍少4.2的数是多少?

    ★★7.15.6比一个数的3倍多0.6,这个数是多少?

    ★★★9.4.6减去1.2与1.5的积,所得的差除以3.5,商是多少?

    ★★16.从37.9里减去3.8的5倍,所得的差再除以0.9,商是多少?

    ★★★17.一个数的3倍减去12.12的一半等于10.44,求这个数.

    ★★23.甲数是54,比乙数的2倍还多6,乙数是多少?

    ★★★25.甲数是乙数的3.5倍,甲、乙两数之和是5.4,求甲、乙两数各是多少?

    答案仅供参考:

    一、1.83+5x 2.2x-28 3.125×5 4.3.5(a-b) 5.(a+b)c

    二、1.C 2.A 3.B 4.B

    三、1.×2.×3.√

    22.60 23.24 24.7.8 25.4.2,1.2

    1. 3/7 × 49/9 - 4/3

    2. 8/9 × 15/36 + 1/27

    3. 12× 5/6 – 2/9 ×3

    4. 8× 5/4 + 1/4

    5. 6÷ 3/8 – 3/8 ÷6

    6. 4/7 × 5/9 + 3/7 × 5/9

    7. 5/2 -( 3/2 + 4/5 )

    8. 7/8 + ( 1/8 + 1/9 )

    9. 9 × 5/6 + 5/6

    10. 3/4 × 8/9 - 1/3

    11. 7 × 5/49 + 3/14

    12. 6 ×( 1/2 + 2/3 )

    13. 8 × 4/5 + 8 × 11/5

    14. 31 × 5/6 – 5/6

    15. 9/7 - ( 2/7 – 10/21 )

    16. 5/9 × 18 – 14 × 2/7

    17. 4/5 × 25/16 + 2/3 × 3/4

    18. 14 × 8/7 – 5/6 × 12/15

    19. 17/32 – 3/4 × 9/24

    20. 3 × 2/9 + 1/3

    21. 5/7 × 3/25 + 3/7

    22. 3/14 ×× 2/3 + 1/6

    23. 1/5 × 2/3 + 5/6

    24. 9/22 + 1/11 ÷ 1/2

    25. 5/3 × 11/5 + 4/3

    26. 45 × 2/3 + 1/3 × 15

    27. 7/19 + 12/19 × 5/6

    28. 1/4 + 3/4 ÷ 2/3

    29. 8/7 × 21/16 + 1/2

    30. 101 × 1/5 – 1/5 × 21

    31.50+160÷40 (58+370)÷(64-45)

    32.120-144÷18+35

    33.347+45×2-4160÷52

    34(58+37)÷(64-9×5)

    35.95÷(64-45)

    36.178-145÷5×6+42 420+580-64×21÷28

    37.812-700÷(9+31×11) (136+64)×(65-345÷23)

    38.85+14×(14+208÷26)

    39.(284+16)×(512-8208÷18)

    40.120-36×4÷18+35

    41.(58+37)÷(64-9×5)

    42.(6.8-6.8×0.55)÷8.5

    43.0.12× 4.8÷0.12×4.8

    44.(3.2×1.5+2.5)÷1.6 (2)3.2×(1.5+2.5)÷1.6

    45.6-1.6÷4= 5.38+7.85-5.37=

    46.7.2÷0.8-1.2×5= 6-1.19×3-0.43=

    47.6.5×(4.8-1.2×4)= 0.68×1.9+0.32×1.9

    48.10.15-10.75×0.4-5.7

    49.5.8×(3.87-0.13)+4.2×3.74

    50.32.52-(6+9.728÷3.2)×2.5

    51.[(7.1-5.6)×0.9-1.15] ÷2.5

    52.5.4÷[2.6×(3.7-2.9)+0.62]

    53.12×6÷(12-7.2)-6 (4)12×6÷7.2-6

    1.(1/69+2/71)*23+25除以71

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

    3.1/2*3+1/3*4+.+1/19乘20

    4.1/27+505/2727+131313/272727

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

    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

    =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

    10-2.65=

    0.9×0.08=

    528-349=

    6+14.4=

    24÷0.04=

    12.34-2.3=

    0÷3.8=

    0.77+0.33=

    7÷1.4=

    67.5+0.25=

    7.2÷8×4=

    5-1.4-1.6=

    400÷125÷8=

    1.9×4×0.5=

    80×0.125=

    2×5-6+2=

    3.2×7÷3.2×7=

    4 +3.2+5 +6.8 25×(8×0.4)×1.25 7

    1125-997 998+1246+9989 (8700+870+87)÷87

    125×8.8 1.3+4.25+3.7+3.75 17.15-(3.5-2.85)

    3.4×99+3.4 4.8×1.01 0.4×(2.5÷73)

    (1.6+1.6+1.6+1.6)×25

    12.3-2.45-5.7-4.55 2 + 0.125×0.25×64

    64.2×87+0.642×1300 78×36+7.8×741-7

    0.125× +0.5 2.42 +4.58 -43×0

    25÷100 4.25-3 -(2 -1 )

    1.25*17.6+36.1/0.8+2.36*12.5

    =(5/4)*17.6+36.1*(5/4)+23.6*(50/4)

    =176/8+361/8+236/8

    =773/8=96.625

    7.5*2.3+1.9*2.5

    =7.5*(1.9+0.4)+1.9*2.5

    =(7.5+2.5)*1.9+7.5*0.4

    =19+3 =22

    2004/2003*2005

    =(2004/2003)*(2003+2)

    =2004+4008/2003

    276*543-267/276+543*275

    =543*(276+275)-267/276

    =543*551-267/276

    17/51+ (68/1+51/2)*17

    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

    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

    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

    (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

    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

    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

    (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

    =9/8

    1.7+150 +3.98 17.625-(4.4+58 ) 3.35×6.47×2+6.7×3.6

    125×(8+0.8+0.08) 910 ×(56 -49 ÷45 )

    2.8×0.4+10.2÷3.4 35 ÷〔78 -(25 +38 )〕 18.7-3.375-6.625

    (9+92+93)×0.01 13.5×[1.5×(1.07+1.93)]

    回答者: fg8y6 - 童生 一级 1-16 13:40

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    其他回答 共 4 条

    1.(1/69+2/71)乘23+25除以71

    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)

    3.1/2乘3+1/3乘4+.+1/19乘20

    4.1/27+505/2727+131313/272727

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

    小学六年级简便计算

    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

    小学六年级数学总复习资料(六) 【简便计算】

    班级: 姓名:

    一、口算下面各题.(23分)

    10-2.65= 0.9×0.08= 528-349= 6+14.4= 24÷0.04=

    12.34-2.3= 0÷3.8= 0.77+0.33= 7÷1.4= 67.5+0.25=7.2÷8×4= 5-1.4-1.6= 400÷125÷8= 1.9×4×0.5=

    80×0.125= 3× = 6 6= 2 -( + )= 10 2=

    3.2×7÷3.2×7= ( - )×12= 187.7×11-187.7= 1- 62.5%=

    二、写出下列每题在简便运算时所运用的定律或性质(12分)

    4 +3.2+5 +6.8 25×(8×0.4)×1.25 7 -(2 - )

    ( ) ( ) ( )

    ( + + )×72 93.5÷3 16÷2.5

    ( ) ( ) ( )

    三、用简便方法计算.(65分)

    1125-997 998+1246+9989 (8700+870+87)÷87

    125×8.8 1.3+4.25+3.7+3.75 17.15-(3.5-2.85)

    3.4×99+3.4 4.8×1.01 0.4×(2.5÷73)

    (1.6+1.6+1.6+1.6)×25 ( + - )÷

    12.3-2.45-5.7-4.55 2 + 0.125×0.25×64

    64.2×87+0.642×1300 78×36+7.8×741-7 17+ 8

    0.125× +0.5 2.42 +4.58 -43

    25÷100 4.25-3 -(2 -1 )

    (1)1.25*17.6+36.1/0.8+2.36*12.5

    1.25*17.6+36.1/0.8+2.36*12.5

    =(5/4)*17.6+36.1*(5/4)+23.6*(50/4)

    =176/8+361/8+236/8

    =773/8=96.625

    (2)7.5*2.3+1.9*2.5

    7.5*2.3+1.9*2.5

    =7.5*(1.9+0.4)+1.9*2.5

    =(7.5+2.5)*1.9+7.5*0.4

    =19+3 =22

    (3)2004/2003*2005

    2004/2003*2005

    =(2004/2003)*(2003+2)

    =2004+4008/2003

    (4)276*543-267/276+543*275

    276*543-267/276+543*275

    =543*(276+275)-267/276

    =543*551-267/276

    (5)17/51+ (68/1+51/2)*17

    17/51+ (68/1+51/2)*17

    后面的做不下去了,好像有一些没有简便方法,不知道你题目有没有抄错,你的68/1中的68是分子还是分母呀?应该是分母都对

    (6)(3.25-0.8*8/5)/(6又4/1-3.5)

    是6又1分之4吗?应该是6又4分之1吧

    1)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

    =9/8

    1.7+150 +3.98 17.625-(4.4+58 ) 3.35×6.47×2+6.7×3.6

    125×(8+0.8+0.08) 910 ×(56 -49 ÷45 )

    2.8×0.4+10.2÷3.4 35 ÷〔78 -(25 +38 )〕 18.7-3.375-6.625

    (9+92+93)×0.01 13.5×[1.5×(1.07+1.93)]