“(8分之1+24分之1+48分之1+80分之1+120分之1+168分之1)*56”用简便方法计算
人气:182 ℃ 时间:2019-10-01 20:03:13
解答
(1/8+1/24+1/48+1/80+1/120+1/168)*56
=(1+1/3+1/6+1/10+1/15+1/21)*(1/8)*56
=(1+2/6+1/6+1/10+1/15+1/21)*7
=(1+1/2+1/10+1/15+1/21)*7
=(1+5/10+1/10+1/15+1/21)*7
=(1+6/10+1/15+1/21)*7
=(1+36/60+4/60+1/21)*7
=(1+4/6+1/21)*7
=7+28/6+1/3
=7+28/6+2/6
=7+5
=12
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