(93-1/9)×1/9+(83-1/9)×1/9+(73-1/9)×1/9+...+(3-1/9)×1/9 怎么算?

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(93-1/9)×1/9+(83-1/9)×1/9+(73-1/9)×1/9+...+(3-1/9)×1/9 怎么算?
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(93-1/9)×1/9+(83-1/9)×1/9+(73-1/9)×1/9+...+(3-1/9)×1/9 怎么算?
(93-1/9)×1/9+(83-1/9)×1/9+(73-1/9)×1/9+...+(3-1/9)×1/9 怎么算?

(93-1/9)×1/9+(83-1/9)×1/9+(73-1/9)×1/9+...+(3-1/9)×1/9 怎么算?
(93-1/9)×1/9+(83-1/9)×1/9+(73-1/9)×1/9+...+(3-1/9)×1/9
=【(93+3)×10/2-1/9×10】×1/9
=【480-10/9】×1/9
=4310/9×1/9
=4310/81