这些题目怎么做?要过程,谢谢!!

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chen_1960
2016-08-20 · TA获得超过4.7万个赞
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(23)
  2/3÷(1-2/3)
  =2/3÷(3/3-2/3)
  =2/3÷1/3
  =2/3x3
  =2
(24)
  (3/4-3/4x5/6)÷3/2
  =(6/8-5/8)÷3/2
  =1/8x2/3
  =1/12
(25)
  2/3x5/7+2/3x2/7
  =2/3x(5/7+2/7)
  =2/3x7/7
  =2/3
(26)
  3/4x1/9+1/4÷9
  =3/4x1/9+1/4x1/9
  =(3/4+1/4)x1/9
  =4/4x1/9
  =1/9
(27)
  5-(6/7÷3/14+3/16)
  =5-(6/7x14/3+3/16)
  =5-(4+3/16)
  =5-(4+3/16)
  =1-3/16
  =13/16
(28)
  2-(1/5+1/3)
  =2-(3+5)/15
  =2-8/15
  =1(7/15)
(29)
  (3/4-3/5)÷7/10
  =(3x5-3x4)/20÷7/10
  =3/20x10/7
  =3/14
(30)
  (2/3+2/9)÷20/21
  =(2x3+2)/9÷20/21
  =8/9x21/20
  =14/15
(31)
  1-5/14÷5/7
  =1-5/14x7/5
  =1-1/2
  =1/2
(32)
  1/4÷(2/3+1/2)x4/5
  =1/4÷[(4+3)/6]x4/5
  =1/4÷7/6x4/5
  =1/4x6/7x4/5
  =6/35
(33)
  [8/5-(4/5-3/10)]x15/14
  =[8/5-(4x2-3)/10]x15/14
  =[8/5-5/10]x15/14
  =[8x2-2]/10x15/14
  =14/10x15/14
  =15/10
  =1(1/2)
(34)
  2/3-(5/6-3/4)÷3/8
  =2/3-(5x2-3x3)/12÷3/8
  =2/3-1/12÷3/8
  =2/3-1/12x8/3
  =2/3-2/6
  =(2x2-2)/6
  =2/3
(35)
  5/14÷[6/7x(4/9+1/6)]
  =5/14÷[6/7x(4x2+1x3)/18]
  =5/14÷[6/7x(4x2+1x3)/18]
  =5/14÷[6/7x11/18]
  =5/14÷22/42
  =5/14x42/22
  =15/22
(36)
  5/9x(9/5+18)
  =5/8x(9+90)/18
  =5/8x99/18
  =3(7/16)
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2016-08-20
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