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数学
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5×6分之一+6×7分之1+7×8分之一+...+49×50分之一的简便运算
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人气:124 ℃ 时间:2020-03-20 14:47:11
解答
1/5*6+1/6*7+1/7*8+-------1/49*50
=1/5-1/6+1/6-1/7+1/7-1/8+-------1/49-1/50
=1/5-1/50
=9/50
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