Let the limit of sequence be equal to P then the value of the expression will be: ответ на тест 861031 - Математика

Let the limit of sequence

be equal to P, then the value of the expression  will be…

The sequence of natural numbers  from  to  is represented without any spaces between them. The decimal sequence obtained is sorted descending the one-digit numbers corresponding to the decimals. For example for   and  the ordered sequence will have the following representation:
98765211110. For  and  the sequence will contain as many “7” digits as____, the first of which is in position with ordinal number _____.
Give your answer in two numbers separated by a comma. For example for  and  in the sequence there will be 19 digits of 7 beginning from position number 39. Thus the result is written as 19,39

两个宽和宽的走廊连接成直角（如图所示）。工人们正在通过这д两个走廊搬运长度不同的钢管。如果钢管始终与地面平行，那么可通过走廊搬运钢管的最大长度是多少米（钢管的厚度可忽略不计）。

Two tunnels  and  wide are connected with each other at the right angel (see Figure). Workers carry tubes of different length along these tunnels. Indicate in meters the greater length of the tube which can be carried along these tunnels in horizontal position.  (ignore the thickness of the tube).

10 吨的货物正装在数量不明的箱子里。每一个箱子的重量不超过1吨。积载量3吨的卡车最少几个次数可以保证把全部货物拉走?

西尔弗船长把一堆珍寶藏了在一个荒岛上。这个荒岛上只有两棵椰子树：小树距离大树400米。西尔弗告诉其它海盗小树和珍寶之间的距离是大树和珍寶之间距离的三倍。
若L -是海盗为了能够发现珍寶而挖掘沟道的最大长度，那么式的数值为…