求解一道小学六年级的数学题

2024-12-04 03:42:29
推荐回答(3个)
回答(1):

=1/2(1/3-1/7+1/7-1/11+1/11-1/15+....+1/39-1/43)
=1/2(1/3-1/43)=20/129

回答(2):

原式=1/2*(4/3*7+4/7*11.......4/39*43)
=1/2*(1/3-1/7+1/7-1/11......1/39-1/43)
=1/2*(1/3-1/43)
=20/129

回答(3):

1/2*(4/3*7+4/7*11.......4/39*43)
=1/2*(1/3-1/7+1/7-1/11......1/39-1/43)
=1/2*(1/3-1/43)
=20/129