计算:(1-1/22)(1-1/32)…(1-1/92)(1-1/102)= _
问题描述:
计算:(1-
)(1-1 22
)…(1-1 32
)(1-1 92
)= ___ 1 102
答
(1-
)(1-1 22
)…(1-1 32
)(1-1 92
),1 102
=(1-
)(1+1 2
)(1-1 2
)(1+1 3
)•…•(1-1 3
)(1+1 9
)(1-1 9
)(1+1 10
),1 10
=
×1 2
×3 2
×2 3
×4 3
×3 4
×…×5 4
×8 9
×10 9
×9 10
,11 10
=
×1 2
,11 10
=
.11 20