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简便计算(要过程):19+1/2-18+1/3+17+1/2-16+1/3+……+1+1/2-1/3=
人气:235 ℃ 时间:2020-04-10 13:24:56
解答
原式=[(19-18)+(17-16)+······+(3-2)+(1-0)+1/2×10+1/3×9-1/3
=1×10+5+3-1/3
=53/3
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