五年級分數脫式計算題,五年級下冊數學分數脫式計算題200及答案

時間 2022-02-11 00:15:38

1樓:牟運恆

34×3.535-3.5×34.34

=34×3.5×1.01-3.5×34×1.01=08+89+899+8999+89999=9+90+900+9000+90000-5=99999-5

=99994

0.67×2.1+0.

018×21+8.5×0.79=0.

67×2.1+0.18×2.

1+8.5×0.79=(0.

67+0.18)×2.1+8.

5×0.79=0.85×2.

1+0.85×7.9

=0.85×(2.1+7.9)

=0.85×10

=8.5

22222.2×9.99999

=22222.2×(10-0.00001)=222222-0.222222

=222221.777778

1997×19961996-1996×19971997=1997×1996×10001-1996×1997×10001=00.02+0.04+0.

06+0.08+……+19.94+19.

96+19.98

=(0.02+19.98)×999÷2

=10×999

=9990

99999×77778+33333×66666=99999×77778+99999×22222=99999×(77778+22222)

=99999×100000

=9999900000

(4又5/6-3又3/4)/(3/14+2/7)=13/12÷1/2

=13/6

=2又1/6

(4.8/1又4/5+3又1/2+7又1/3)*4/9=(2又2/3+7又1/3+3.5)*4/9=(10+3.5)*4/9

=13.5*4/9

=617.2/【(3又2/5-1.25)*2/3】=17.2/【2.15*2/3】

=17.2÷43/3

=1.2

5*5又1/5

=5*5+5*1/5

=25+1

=26(5又2/5-1.8)/[(1.15+13/20)*1又2/3]

=3.6/[1.8*5/3]

=3.6/3

=1.2

3又5/8*5又1/5+5又1/5*6又3/8=5.2*(3又5/8+6又3/8)

=5.2*10

=52[3/4-7/8/(5/6+4/5)]*28=[3/4-7/8÷49/30]*28

=[3/4-15/28]*28

=3/4*28-15/28*28

=21-15

=6(1.25*4/5-0.76)/(1又3/8+1又1/40)=(1-0.76)/2.4

=0.24/2.4

=0.1

[(0.2+1/3)*4.5]/(8又1/20-6.45)=8/15*4.5/1.6

=2.4/1.6

=1.5

x+3又2/3=5

x*9又3/4=7又1/11 x/2/5=106又2/3-x=4.25 6.4*1.

7+6又2/5*8.3(4又6/7+1.75)/1又11/14+3又5/62.

16-7x=0.06

1/2x-0.5=5又1/2

8.16-1.26/0.3*1.5

=8.16-4.2*1.5

=8.16-6.3

=1.86

8.4*[(1.2+3又1/3)/3.4-1/2]=8.4*[68/16/3.4-1/2]

=8.4*[5/4-1/2]

=8.4*3/4

=6.3

5.8:x=3又1/2:7

3.5x=7*5.8

x=7/3.5*5.8

x=2*5.8

x=11.6

3/10*55-4x=14.5

16.5-4x=14.5

4x=2

x=0.2

19.38-4又7/8-5又1/8

=1.938-(4又7/8+5又1/8)

=19.38-10

=9.38

13又7/13-(6又3/5+3又7/13)=13又7/13-3又7/13-6又3/5=10-6又3/5

=3.4

1又3/4+[2又3/14-(2又3/14-1.875)]/2又1/12

=1又3/4-15/8*12/25

=1又3/4-9/10

=0.85

(9.4-8又2/5)/[(1.1+1/15)*1又7/18]=1/[7/6*25/18]

=1÷175/108

=108/175

2樓:新野旁觀者

60×(1/12+1/15+1/4)

=60×1/12+60×1/15+60×1/4=5+4+15

=24(5/12-3/8)×72

=5/12×72-3/8×72

=30-27

=37/25×4/9+7/25×5/9

=7/25×(4/9+5/9)

=7/25×1

=7/25

6/7-5/24÷7/12

=6/7-5/24×12/7

=12/14-5/14

=7/14

=1/2

[3/4×(7/16-1/4)]÷9/13=3/4×(7/16-4/16)×13/9=1/4×3/16×13/3

=13/64

2/3-7/8+1/3

=(2/3+1/3)-7/8

=1-7/8

=1/8

5/6-(3/7-1/6)

=(5/6+1/6)-3/7

=1-3/7

=4/7

1-1/3-2/3

=1-(1/3+2/3)

=1-1

=01+3/5-1/10

=1+6/10-1/10

=1+1/2

=1又1/2

3/8-12/13+5/8

=3/8+5/8-12/13

=1-12/13

=1/13

1-(1/2-3/4)

=1+3/4-2/4

=1+1/4

=5/4

1-1/2-1/4

=1/2-1/4

=2/4-1/4

=1/4

2/7-8/9+5/7

=(2/7+5/7)-8/9

=1-8/9

=1/9

2-1/4-3/4

=2-(1/4+3/4)

=2-1

=11/2-(3/8-1/2)

=1/2+1/2-3/4

=1-3/8

=5/8

五年級下冊數學分數脫式計算題200及答案

3樓:匿名使用者

1題:原式=1/3-1/4+1/4-1/5+1/5-···+1/98-1/99

=1/3-1/99

=32/99

2題:原式=1.2*30*1.09+1.2×67.3

=1.2×(67.3+32.7)

=1.2*100

=120

3題:原式=1.8*40*2.09-1.8*73.6

=1.8*(83.6-73.6)

=1.8*10

=184題:原式=4*1.7*8*2.1*19.3*8*4*0.1

=4*8*(1.7*2.1+19.3*0.1)

=32*5

=160

5題:原式=1.2*40*1.08+1.2×56.8

=1.2*(43.2+56.8)

=1.2*100

=120

6題:原式=0.9999×0.7+0.1111*9*0.3

=0.9999*0.7+0.9999*0.3

=0.9999*(0.7+0.3)

=0.9999

1題.經過嘗試可發現:1/(3*4)=1/3-1/4,之後所有的都以此類推就ok了.

2到6:思路都一樣,找到一個最小公約數,之後把這個數提出來,括號裡面多半是10、100這樣的數,ok了.

7.2000*1999-1999*1998+1998*1997-1997*1996

=1999*(2000-1998)+1997*(1998-1996)

=1999*2+1997*2

=(1999+1997)*2

=(2000-1+2000-3)*2

=8000-8

=7992

8.(0.75*42.7+57.3-0.573*25)/3*7972

=(0.75*42.7+57.3*1-57.3*0.25)/3*7972

=[0.75*42.7+57.3(1-0.25)]/3*7972

=[0.75*42.7+57.3*0.75]/3*7972

=[(42.7+57.3)*0.75]/3*7972

=75/3*7972

=25*7972

=199300

9./(1*2) + 1/(2*3) + 1/(3*4) + 1/(4*5) + 1/(5*6) + …… + 1/(99*100)

=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+.+1/98-1/99+1/99-1/100

=1-1/100

=99/100

抱歉實在太難找了,這裡只有9道.

五年級上分數乘除脫式計算題300道

4樓:阿維

1、98×8/99

解析:此題先利用減法分配律把98轉換成(99-1),再利用乘法結合律來脫式計算。

98×8/99

=(99-1)×8/99

=99×8/99-1×8/99

=8-8/99

=7又91/99

2、27×17/26

解析:此題先用加法分配律,把27轉換成(26+1),再利用乘法結合律來脫式計算。

27×17/26

=(26+1)×17/26

=26×17/26+1×17/26

=17+17/26

=17又17/26

3、46×44/45

解析:此題先利用加法分配律把46轉換成(45+1),再利用乘法結合律:(a×b)×c=a×(b×c)使得運算簡便。

46×44/45

=(45+1)×44/45

=45×44/45+44/45

=44+44/45

=44又44/45

4、3/5-3/5×1/3

解析:先利用乘法分配律,把3/5轉換成3/5×1,提取公因數3/5,再利用乘法結合律來脫式計算。

3/5-3/5×1/3

=3/5×1-3/5×1/3

=3/5(1-1/3)

=3/5×2/3

=6/15

=2/5

5、3.5×4/5+5.5×80%+0.8

解析:此題先把4/5和80%換算成0.8,0.8寫作1×0.8,再利用乘法分配律做簡便計算,方法如下:

3.5×4/5+5.5×80%+0.8

=3.5×0.8+5.5×0.8+1×0.8

=(3.5+5.5+1)×0.8

=10×0.8=8

5樓:凌月霜丶

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 × 5/97.5/2 -( 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 × 11/514.31 × 5/6 – 5/6

15.9/7 - ( 2/7 – 10/21 )16.5/9 × 18 – 14 × 2/717.

4/5 × 25/16 + 2/3 × 3/418.14 × 8/7 – 5/6 × 12/1519.17/32 – 3/4 × 9/2420.

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 × 1527.7/19 + 12/19 × 5/628.1/4 + 3/4 ÷ 2/3

29.8/7 × 21/16 + 1/2

30.101 × 1/5 – 1/5 × 21

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