Xiao Ming read a story book. He read 65 pages two days ago, 27 pages less than the rest. How many pages are there in this story book?

Xiao Ming read a story book. He read 65 pages two days ago, 27 pages less than the rest. How many pages are there in this story book?

A: there are 156 pages in this story book

According to the first few terms of the sequence, write a general formula of the following sequence: (1) 4 / 5, 1 / 2, 4 / 11, 2 / 7 (2)1/2,1/4,

(1)an=4/(3n+2)
(2)an=1/2^n

What is the difference between P = a (1 + sin θ) and P = a (1 + cos θ)?

As shown in the figure, the blue curve is p = a (1 + sin θ), and the red curve is p = a (1 + cos θ). You can see that the shapes of the two are the same, but the red is obtained by turning the blue clockwise 90 ° phase, that is, P = a (1 + cos θ) = a (1 + cos (- θ)) = a (1 + sin (π / 2 + θ))

Can sodium formate react with soda lime to produce methane?

Hcoona + NaOH = Na 2CO 3 + H 2, can be used
In fact, the essence of the reaction is decarboxylation, i.e. the carboxyl group (or - COONa) is replaced by hydrogen atom, and a part of CO2 is removed, i.e. R-COOH → R-H + CO2

The physical quantity () representing the speed of variable speed motion, formula: ()

The physical quantity (acceleration) representing the speed of variable speed motion,
Formula:
Acceleration a = (VT VO) / T {take VO as positive direction, a and VO in the same direction (acceleration) a > 0; reverse direction, a}

Is the abbreviation of logarithm based on e ln or in
Such as the title

In

How many degrees of west longitude is 180 ° east longitude? In addition, how many degrees of east longitude and west longitude are obtained by rotating 90 ° east longitude and 20 ° west longitude respectively?

East longitude 180 = west longitude 180.. east longitude 110 if turning east 90.. west longitude 70 if turning West 90

An = 2 ^ n-1 (n is odd) an = 2N-1 (n is even) Sn is the sum of the first n terms of the sequence {an}
An = 2 ^ n-1 (n is odd)
An = 2N-1 (n is even)
SN is the sum of the first n terms of the sequence {an}, then A9 = 256, S9=__ ,S2m=___

First of all, there is a bracket missing in the title: it should be an = 2 ^ (n-1) (n is odd), this is an equal ratio sequence, otherwise it is not an equal ratio sequence. The solution is very simple. The whole sequence is divided into two parts: let the odd term be an equal ratio sequence BN, the first term be 1, the common ratio be 4, the even term be an equal difference sequence, the first term be 3, and the tolerance be 4

The number of real roots of the equation x + | lgx | = 2 is,

Lgx = plus or minus 2-x
You can see the answer by drawing function image. You can only use image or gather one. This is transcendental equation. Please refer to the following encyclopedia website

How many hours is two hours and two minutes
Come on,

About 2.03 hours. 2.03, 3 cycles