1/2+1/6+1/12+1/20.+1/2070
2个回答
1/2+1/6+1/12+1/20.+1/2070
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+……+1/45-1/46
=1-1/46
=45/46
相关问题
1/2,-1/6,1/12,-1/20,?
1/2+1/6+1/12+1/20=
2\1+6\1+12\1+20\1+30\1=?
1/2+1/6+1/12+1/20+1/30=
1/2+1/6+1/12+1/20+.+1/9900
1/2+1/6+1/12+1/20+.1/110=?
1％2+1％6+1％12+1％20+……+1％9900＝
1/2+1/6+1/12+1/20+1/30
1/2+1/6+1/12+1/20+.+1/4022030=?
1－1/2*1/6*1/12*1/20*1/30