0.1×0.2×0.3×0.4×0.5×0.6×0.7×0.8×0.9怎么巧算
人气:339 ℃ 时间:2019-11-02 10:05:30
解答
化为分数,即1/10*2/10*3/10*4*10*5/10*6/10*7/10*8/10*9/10=1/10*1/5*3/10*1/5*3/5*7/10*2/5*9/5=1/10*1/5*3/10*1/5*3/5*7/5*1/5*9/5=(81*7)/(25*25*25*100)=567/1562500=0.00036288
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