1÷2×4+1÷4×6+1÷2006×2008
=2+(3/2)+(2008/2006)
=2+(3/2)+(1004/1003)
=9029/2006.你没看见这局话中的“到”吗?1除以2乘4加上1除以4乘6加“到”1除以2006乘2008知道了。用裂项法:由1/2×4+1/4×6+1/6×8+。。。+1/2006×2008=(1/2)(2/2×4+2/4×6+2/6×8+。。。+2/2006×2008)=(1/2)[(1/2-1/4)+(1/4-1/6)+(1/6-1/8)+。。。+(1/2006-1/2008)]=(1/2)(1/2-1/2008)=1003/4016.
1除以2乘4加上1除以4乘6加到1除以2006乘2008
1除以2乘4加上1除以4乘6加到1除以2006乘2008
数学人气:343 ℃时间:2020-01-26 07:59:31
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