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五年级上分数乘除脱式计算题300道

答案:6  悬赏:10  手机版
解决时间 2021-04-04 09:16
  • 提问者网友:末路
  • 2021-04-04 06:21
快,我很急的
最佳答案
  • 五星知识达人网友:低血压的长颈鹿
  • 2019-11-15 21:48
1、98×8/99
解析:此题先利用减法分配律把98转换成(99-1),再利用乘法结合律来脱式计算。
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:此题先用加法分配律,把27转换成(26+1),再利用乘法结合律来脱式计算。
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:此题先利用加法分配律把46转换成(45+1),再利用乘法结合律:(a×b)×c=a×(b×c)使得运算简便。
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转换成3/5×1,提取公因数3/5,再利用乘法结合律来脱式计算。
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:此题先把4/5和80%换算成0.8,0.8写作1×0.8,再利用乘法分配律做简便计算,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
全部回答
  • 1楼网友:底特律间谍
  • 2020-05-14 12:45
45×2/5+1/5×2
  • 2楼网友:行路难
  • 2020-06-28 15:41
1/5×1/2×2/5=1/25 2/15×5/6×3/2=1/6 4/7×15/22×7/12=5/22 9/10×13/17+9/10×4/17=9/10 4/7×6×5/12 19/24×8/19×15/16 25/6×7/10÷21/8 2/3÷5/6÷4/5 4/9×3/5×1/4 11/13×(4/5×26/33) 21/17-5/18-13/18 15×19×(1/15+2/19) 1/4+1/7+6/7 (3/4+2/3+1/6)×12 3/4×2/5+3/5×3/4 [1-(1/4+1/5)]÷33/40
  • 3楼网友:山河有幸埋战骨
  • 2020-09-24 04:15
  • 5/3 × 11/5 + 4/3
  • 45 × 2/3 + 1/3 × 15
  • 7/19 + 12/19 × 5/6
  • 1/4 + 3/4 ÷ 2/3
  • 8/7 × 21/16 + 1/2
  • 101 × 1/5 – 1/5 × 21
  • 50+160÷40
  • (58+370)÷(64-45)
  • 120-144÷18+35
  • 347+45×2-4160÷52
  • (58+37)÷(64-9×5)
  • 95÷(64-45)
  • 178-145÷5×6+42
  • 420+580-64×21÷28
  • 9 × 5/6 + 5/6
  • 3/4 × 8/9 - 1/3
  • 7 × 5/49 + 3/14
  • 6 ×( 1/2 + 2/3 )
  • 8 × 4/5 + 8 × 11/5
  • 31 × 5/6 – 5/6
  • 9/7 - ( 2/7 – 10/21 )
  • 5/9 × 18 – 14 × 2/7
  • 4/5 × 25/16 + 2/3 × 3/4
  • 14 × 8/7 – 5/6 × 12/15
  • 812-700÷(9+31×11)
  • (136+64)×(65-345÷23)
  • 85+14×(14+208÷26)
  • (284+16)×(512-8208÷18)
  • 120-36×4÷18+35
  • (58+37)÷(64-9×5)
  • (6.8-6.8×0.55)÷8.5
  • 0.12× 4.8÷0.12×4.8
  • (3.2×1.5+2.5)÷1.6
  • 3.2×(1.5+2.5)÷1.6
  • 3/14 ×× 2/3 + 1/6
  • 1/5 × 2/3 + 5/6
  • 9/22 + 1/11 ÷ 1/2
  • 5/3 × 11/5 + 4/3
  • 45 × 2/3 + 1/3 × 15
  • 7/19 + 12/19 × 5/6
  • 1/4 + 3/4 ÷ 2/3
  • 8/7 × 21/16 + 1/2
  • 10.15-10.75×0.4-5.7
  • 5.8×(3.87-0.13)+4.2×3.74
  • 32.52-(6+9.728÷3.2)×2.5
  • [(7.1-5.6)×0.9-1.15] ÷2.5
  • 5.4÷[2.6×(3.7-2.9)+0.62]
  • 12×6÷(12-7.2)-6
  • 12×6÷7.2-6
  • 8/9 × 15/36 + 1/27
  • 12× 5/6 – 2/9 ×3
  • 8× 5/4 + 1/4
  • 6÷ 3/8 – 3/8 ÷6
  • 4/7 × 5/9 + 3/7 × 5/9
  • 5/2 -( 3/2 + 4/5 )
  • 7/8 + ( 1/8 + 1/9 )
  • 17/32 – 3/4 × 9/24
  • 3 × 2/9 + 1/3
  • 5/7 × 3/25 + 3/7
  • 101 × 1/5 – 1/5 × 21
    • 4楼网友:鸽屿
    • 2021-01-16 16:32
    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
    • 5楼网友:西风乍起
    • 2021-03-09 17:25
    8/63 * 9/70 * 15/28 = ? 10/63 * 9/28 * 14/15 = ? 15/56 * 9/56 * 9/70 = ? 12/35 * 8/105 * 9/10 = ? 18/35 * 12/35 * 14/45 = ? 9/56 * 9/28 * 9/20 = ? 14/45 * 9/14 * 21/40 = ? 12/35 * 8/63 * 8/15 = ? 20/21 * 8/21 * 28/45 = ? 9/70 * 9/35 * 9/28 = ? 9/35 * 9/56 * 20/63 = ? 9/280 * 20/63 * 12/35 = ? 35/72 * 21/40 * 8/105 = ? 8/9 * 8/63 * 8/63 = ? 35/36 * 40/63 * 8/35 = ? 9/14 * 10/21 * 21/40 = ? 9/56 * 15/56 * 9/70 = ? 8/105 * 10/63 * 20/21 = ? 45/56 * 8/63 * 8/35 = ? 8/63 * 9/35 * 18/35 = ? 21/40 * 9/10 * 9/14 = ? 9/14 * 8/21 * 8/35 = ? 14/15 * 12/35 * 10/63 = ? 24/35 * 12/35 * 9/10 = ? 9/40 * 24/35 * 9/10 = ? 24/35 * 9/10 * 15/56 = ? 9/56 * 8/9 * 35/36 = ? 9/70 * 9/140 * 9/14 = ? 35/36 * 15/28 * 35/36 = ? 14/45 * 9/28 * 9/56 = ? 9/28 * 8/63 * 8/35 = ? 18/35 * 10/21 * 8/9 = ? 18/35 * 8/9 * 9/35 = ? 8/45 * 45/56 * 35/36 = ? 9/140 * 40/63 * 9/70 = ? 9/56 * 35/72 * 9/56 = ? 8/9 * 18/35 * 9/280 = ? 28/45 * 9/35 * 8/105 = ? 35/72 * 10/21 * 10/21 = ? 8/63 * 9/35 * 8/45 = ?
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