所以an=a1+(n-1)d=-2+2(n-1)=2n-4.故答案为2n-4. 分别求出求出f(x-1)和f(x+1)得到a1和a3,然后利用等差中项的概念列式求得x的值,根据数列{an}是公差为正数的等差数列对首项及公差进行取舍,从而求出数列{an}的通项公式. 本题考点:等差数列的通项公式. 考点点评:本题考查了等差数列的通项...
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An element (5) engageable with one or more other similar elements (5) is disclosed. The element includes a recess (10) in its outer surface for casting a concrete stringer (43) and reinforcements (15). The free end of at least one rigid bearing member (16) secured to said element (...
The reports include an indication of a connection to or disconnection from one of the WiFi access points, a time of the connection or disconnection, and an identifier of the one of the WiFi access points. Data including connect times and disconnect times may be generated from the reports. ...