1/3+1/6+1/10+1/15+1/21+1/28=?
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1/3+1/6+1/10+1/15+1/21+1/28=?
1/3+1/6+1/10+1/15+1/21+1/28=?
1/3+1/6+1/10+1/15+1/21+1/28=?
1/3+1/6+1/10+1/15+1/21+1/28
=1/3+1/2*1/3+1/2*1/5+1/3*1/5+1/3*1/7+1/4*1/7
=1/3*(1+1/2)+1/5*(1/2+1/3)+1/7*(1/3+1/4)
=1/3*3/2+1/5*5/6+1/7*7/12
=1/2+1/6+1/12
=6/12+2/12/1/12
=9/12
=3/4
1/3+1/6+1/10+1/15+1/21+1/28
=(1/3+1/6)+(1/10+1/15)+(1/21+1/28)
=1/2+1/6+1/12
=9/12
=3/4
1/3+1/6+1/10+1/15+1/21+1/28
=(1/3+1/6)+(1/10+1/15)+(1/21+1/28)
=1/2+1/6+1/12
=6/12+2/12+1/12
=3/4
上面说的对