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18/17×4/5-4/14×3/517×14×（8/7-14/17)(1/2-1/4/3)×2/5+2/5简便计算
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18/17×4/5-4/14×3/5
=18/17×4/5-3/14×4/5
=（18/17-3/14）×4/5
=201/238×4/5
=402/595
17×14×（8/7-14/17)
=17×14×8/7-17×14×14/17
=272-196
=76
(1/2-1/4/3)×2/5+2/5
=（1/2-3/4+1）×2/5
=3/4×2/5
=3/10
=18/17×4/5-3/14×4/5
=（18/17-3/14）×4/5
=201/238×4/5
=402/595
17×14×（8/7-14/17)
=17×14×8/7-17×14×14/17
=272-196
=76
(1/2-1/4/3)×2/5+2/5
=（1/2-3/4+1）×2/5
=3/4×2/5
=3/10
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