如题所述
第1个回答 2020-06-08
1/2+1/6+1/12+1/20+1/30=5/6
第2个回答 2019-01-15
1/2+1/6+1/12+1/20+1/30
=6/12+2/12+1/12+3/60+2/60
=9/12+5/60
=9/12+1/12
=10/12
=5/6
=6/12+2/12+1/12+3/60+2/60
=9/12+5/60
=9/12+1/12
=10/12
=5/6
第3个回答 2017-09-29
1/2+1/6+1/12+1/20
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)
=1-1/5
=4/5
=(1-1/2)+(1/2-1/3)+(1/3-1/4)+(1/4-1/5)
=1-1/5
=4/5
第4个回答 2021-01-11
第5个回答 2020-06-20
1/2+1/6+1/12+1/20+1/30
=2/3+1/12+1/20+1/30
=3/4+1/20+1/30
=4/5+1/30
=5/6
=2/3+1/12+1/20+1/30
=3/4+1/20+1/30
=4/5+1/30
=5/6
