If the limit (1 + A + A ^ 2 +... + A ^ (n-1)) = 2 / 3, then the coefficient sum of binomial (x-2a) ^ 10 expansion is

If the limit (1 + A + A ^ 2 +... + A ^ (n-1)) = 2 / 3, then the coefficient sum of binomial (x-2a) ^ 10 expansion is

lim(n-->∞)（1+a+a^2+...+a^(n-1))=2/3
∴1/(1-a)=2/3
∴2-2a=3
∴a=-1/2
The binomial (x-2a) ^ 10 is (x + 1) ^ 10
Let x = 1, the sum of coefficients of the expansion is
2^10=1024

How to calculate the sum of the coefficients in binomial?
Is it to make all unknowns 1?

Making the letter equal to 1 is used to calculate the sum of the coefficients of all terms. At this time, the letter is equal to 1, and the rest is the sum of all the coefficients

What is the product of the sine of 7 / 6 π and the cosine of 5 / 6 π

sin7/6pi=sin(pi+1/6pi)=-sin1/6pi=-1/2
Cos5 / 6pi = cos (PI-1 / 6pi) = - cos1 / 6pi = - radical 3 / 2
Product = radical 3 / 4

What is the sine of 2 / 5

57 degrees

Calculation of degree, minute and second
(1) (2) 32 ° 16 ′ 25 ″ × 4-78 ° 25 ′ (3) 180 ° - 37 ° 5 ′× 4 + 93.1 ° 5 ″

360°÷7=(360×60')÷7
           =21600'÷7
           =3085.7142857142857142857142857143'
&Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; ≈ & nbsp; 3085 & #39; & nbsp; & nbsp; & nbsp; / /: & nbsp; divide by 60 'to get the reading
&Nbsp; & nbsp; & nbsp; & nbsp; & nbsp; = & nbsp; 51 ° 25 & # 39; & nbsp; & nbsp; & nbsp; / /: & nbsp; fraction multiplied by 60 'score
 32°16′25″×4-78°25′
=32°×4+16’×4+25“×4-78°-25'
=(128°-78°)+(64'-25')+100"
=50°39'100"
=50°40'40"
180°-37°5′×4+93.1°÷5
=180°-37°*4-20'+93.1°÷5=31°40'+18°37'12''=(31+18)°(77)'(12)''
=50°17'12''

The angle is calculated in degrees, minutes and seconds!
1.57.32 & # 730; (expressed in degrees, minutes and seconds)
2.10 & # 730; 23'24 "(expressed in degrees)

0.32*60=28.8
0.8*60=54
57.32=57.28.54
57 degrees, 28 minutes, 54 seconds
24/60=0.4
23.4/60=0.39
10 + 0.39 = 10.39 degrees

How does Casio fx-82es plus calculate the nth power of a number?

Press the key on the right side of x square, a large box and a small box will appear in the upper right corner. Enter a number in the large box and N power in the small box. Press "=" to get the result

How can Casio calculator convert the number 7000 into a form of 7 times 10 cubic?
How can Casio calculator convert the number 7000 into the form of 7 * 10 cubic?

Eng in the bottom row of function keys
Shift + eng less than one

How to calculate the 0.2877th power of E? Using Casio Fx-82MS

Using Casio Fx-82MS calculator, the calculation steps are as follows:
1. Shift (the first in the first row)
2. In
3.0.2877
4.=
The result is obtained (0.2877 power of E is about 1.333357237)
If you have any questions, you can add them

How to calculate the 0.2877 power of E? Using Casio Fx-82MS, how to calculate the result with your method is not the same?

How about a calculator? E = 2.71828
Maple result: 100 decimal places
1.333357236945224700598216442199453653859457089540501493742798510528285701794115854025036915147698436