4/3*5/7+7/3除以7/5 40*(3/5+7/8) 1/5除以(7/5+2/7*21/5) 5/6*2/3除以(3/5-4-4/15)
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![4/3*5/7+7/3除以7/5 40*(3/5+7/8) 1/5除以(7/5+2/7*21/5) 5/6*2/3除以(3/5-4-4/15)](/uploads/image/z/118812-12-2.jpg?t=4%2F3%2A5%2F7%2B7%2F3%E9%99%A4%E4%BB%A57%2F5+40%2A%283%2F5%2B7%2F8%29+1%2F5%E9%99%A4%E4%BB%A5%287%2F5%2B2%2F7%2A21%2F5%29+5%2F6%2A2%2F3%E9%99%A4%E4%BB%A5%EF%BC%883%2F5-4-4%2F15%29)
4/3*5/7+7/3除以7/5 40*(3/5+7/8) 1/5除以(7/5+2/7*21/5) 5/6*2/3除以(3/5-4-4/15)
4/3*5/7+7/3除以7/5 40*(3/5+7/8) 1/5除以(7/5+2/7*21/5) 5/6*2/3除以(3/5-4-4/15)
4/3*5/7+7/3除以7/5 40*(3/5+7/8) 1/5除以(7/5+2/7*21/5) 5/6*2/3除以(3/5-4-4/15)
4/3*5/7+7/3除以7/5
=20/21+5/3
=(20+35)/21
=55/21
40*(3/5+7/8)
=40*(24+35)/40
=24+35
=59
1/5除以(7/5+2/7*21/5)
=1/5除以(7/5+6/5)
=1/5除以13/5
=1/5*5/13
=1/13
5/6*2/3除以(3/5-4-4/15)
=5/9除以(9-60-4)/15
=5/9*15/(-55)
=-5/99
1、4/3*5/7+7/3÷7/5
=4/3*5/7+7/3*5/7
=5/7(4/3+7/3)
=5/7*11/3
=55/21
2、40*(3/5+7/8)
=40*3/5+40*7/8
=24+35
=59
3、1/5÷(7/5+2/7*21/5)
=...
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1、4/3*5/7+7/3÷7/5
=4/3*5/7+7/3*5/7
=5/7(4/3+7/3)
=5/7*11/3
=55/21
2、40*(3/5+7/8)
=40*3/5+40*7/8
=24+35
=59
3、1/5÷(7/5+2/7*21/5)
=1/5÷(7/5+6/5)
=1/5÷7/5+1/5÷6/5
=1/5*5/7+1/5*5/6
=7/25+6/25
=13/25
4、5/6*2/3÷(3/5-4-4/15)
=5/9÷(9-60-4)/15
=5/9*15/(-55)
=-5/99
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