第7,8题怎么做
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7、
(1/2)+(1/2)×(1/3)+(1/3)×(1/4)+……+(1/10)×(1/11)
=(1/2)+[(1/2)-(1/3)]+[(1/3)-(1/4)]+……+[(1/10)-(1/11)]
=1-(1/11)
=10/11
8、
当x=81时(x≠1),则x=81÷3=27
当x=27时(x≠1),则x=27÷3=9
当x=9时(x≠1),则x=9÷3=3
当x=3时(x≠1),则x=3÷3=1
当x=1时(x=1),则x=1+2=3
……
后面看不清楚是第几次!!!
(1/2)+(1/2)×(1/3)+(1/3)×(1/4)+……+(1/10)×(1/11)
=(1/2)+[(1/2)-(1/3)]+[(1/3)-(1/4)]+……+[(1/10)-(1/11)]
=1-(1/11)
=10/11
8、
当x=81时(x≠1),则x=81÷3=27
当x=27时(x≠1),则x=27÷3=9
当x=9时(x≠1),则x=9÷3=3
当x=3时(x≠1),则x=3÷3=1
当x=1时(x=1),则x=1+2=3
……
后面看不清楚是第几次!!!
追问
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