问题标题:
超级难数学题12121212121121121121111—————乘--------------------+-------+-----------+-----------+132132132132212121212612111-------+--------+---------=203042
问题描述:
超级难数学题
12121212121121121121111
—————乘--------------------+-------+-----------+-----------+
132132132132212121212612
111
-------+--------+---------=
203042
石光回答:
原式=(4/7)*(11/12)+1/(1*2)+1/(2*3)+1/(3*4)+1/(4*5)+1/(5*6)+1/(6*7)
=44/84+1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+1/5-1/6+1/6-1/7
=11/21+6/7
=11/21+18/21
=29/21
完毕
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