这些题目怎么做?要过程,谢谢!!
2个回答
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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)
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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