(10-2/55x1)+(9-2/55x2)+(8-2/55x3)+....+(1-2/55x10)
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(10-2/55x1)+(9-2/55x2)+(8-2/55x3)+....+(1-2/55x10)

(10—2/55x1WEnTiyi.cOM)十(9一2/55x2)十(8一2/55x3)+…十(1一2/55x10)
=(10+9+8+.+2+1)-2/55×(1+2+.+10)
=55-2/55×55
=55-2
=53
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