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数学
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两道难（应该有简便算法）的数学题!
0.1+0.3+0.5+0.7+0.9+0.11……………………+0.97+0.99
某数除以一个数,商5余0.5,被除数扩大3倍,商178余0.1,那么被除数应为多少?
……………………?
人气：352 ℃ 时间：2020-06-23 06:11:46
解答
(0.1+0.9)×(50÷2)
=1×25=25
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（1+1/2)×(1-1/2)×(1+1/3)×(1-1/3)×…×(1+1/99)×(1-1/99)×(1-1/2)×(1+1/3)×(1-1/3)×…×(1+1/99)×(1-1/99)= _ ．
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