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(10-3/55×1)+(9-3/55×2)+(8-3/55×3)+……+(2-3/55×9)+(1-3/55×10)=?
(10-3/55×1)+(9-3/55×2)+(8-3/55×3)+……+(2-3/55×9)+(1-3/55×10)=?
人气:454 ℃ 时间:2020-03-21 01:11:56
解答
原式=10+9+8.+1-3/55×(1+2+3.+10)
=55-3/55×55
=55-3
=52
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