小学六年级数学题:1/1*2+1/2*3+1/3*4+......+1/29*30=?
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1/1×2+1/2×3+1/3×4+......+1/29×30
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+.......+(1/29-1/30)
=1-1/30
=29/30
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+.......+(1/29-1/30)
=1-1/30
=29/30
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1/1×2+1/2×3+1/3×4+…+1/29×30
=1/1-1/2+1/2-1/3+1/3…-1/29+1/29-1/30
=1-(1/2-1/2)-(1/3-1/3)…-(1/29-1/29)-1/30
=1-1/30
=29/30
=1/1-1/2+1/2-1/3+1/3…-1/29+1/29-1/30
=1-(1/2-1/2)-(1/3-1/3)…-(1/29-1/29)-1/30
=1-1/30
=29/30
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展开全部
1/1×2+1/2×3+1/3×4+......+1/29×30
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+.......+(1/29-1/30)
=1-1/30
=29/30
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+.......+(1/29-1/30)
=1-1/30
=29/30
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已踩过<
评论
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你对这个回答的评价是?
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