(1-(1/5+1/7.5)×2)÷(1/7.5)等于多少有好评.
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(1-(1/5+1/7.5)×2)÷(1/7.5)等于多少有好评.
![(1-(1/5+1/7.5)×2)÷(1/7.5)等于多少有好评.](/uploads/image/z/19726103-47-3.jpg?t=%281-%281%2F5%2B1%2F7.5%29%C3%972%29%C3%B7%281%2F7.5%29%E7%AD%89%E4%BA%8E%E5%A4%9A%E5%B0%91%E6%9C%89%E5%A5%BD%E8%AF%84.)
(1-(1/5+1/7.5)×2)÷(1/7.5)
= (1-(3/15+2/15)×2)÷(2/15)
=(1-1/3×2)÷2/15
=(1-2/3)÷2/15
=1/3÷2/15
=1/3×15/2
=5/2
= (1-(3/15+2/15)×2)÷(2/15)
=(1-1/3×2)÷2/15
=(1-2/3)÷2/15
=1/3÷2/15
=1/3×15/2
=5/2