Is 1 / y a monomial How is it? Is it 0.0 No, what's the style again

Is 1 / y a monomial How is it? Is it 0.0 No, what's the style again

The denominator has unknowns
So it's not an integral
So it's not a monomial

Observe the characteristics of the following algebraic expressions and write the nth monomial according to this rule
xy,2xy,4xy,8xy,16xy,...
Try to guess what is the nth monomial? What are its coefficients and times?
I would be very grateful if you could help me

The characteristic of this polynomial is that the coefficient of each is the nth power of 2, and then multiplied by an XY. That is, its nth polynomial is: 2 ^ n * XY

Observe the characteristics of the following series of monomials: 1 / 2x & # 178; a, - 1 / 4x & # 178; a & # 178;, 1 / 8x & # 178; a & # 179
Write the eighth monomial? What is it?
What's the nth monomial? What's its coefficient? How many times?

1 write the eighth monomial - 1 / 256x ^ 2A ^ 8, which is a 10 degree monomial,
The nth monomial is (- 1) ^ (n + 1) x ^ 2A ^ (n), its coefficient is (- 1) ^ (n + 1), and its degree is n + 2

1+3+5+7+9+11+13+…… +91+93+95+97+99=?

1030

Fill in the blanks according to the rule: 1 / 3, - 2 / 15,3 / 35,4 / 63,5 / 99, -,..., the nth number is -

6/143 ,n/(2n-1)(2n+1)

Fill in the blanks 4 / 9, 2 / 9, 1 / 9, (), 1 / 36, (), ()

4/9 2/9 1/9 1/18 1/36 1/72 1/144

Fill in the numbers according to the rules: - 1, 4, - 9, 16, - 25, 36, (), ()

:-1、4、-9、16、-25、36、(-49)、(64).
Odd terms are negative, even terms are positive. They are the squares of positive integers
Please refer to,

Fill in the number according to the rule: - 1,4, - 9,16, - 25,36 (), the number of the hundredth is ()

The rule is that each number is the square of the number of items, and if the number of items is odd, a negative sign is added
So the 100th number is 10000

Observe the following data and fill in the appropriate number on the horizontal line according to a certain rule, - 1 / 2,1 / 2, - 3 / 8

-1/2,1/2,-3/8,.1/4,.
-1/2,2/4,-3/8,4/16,.
General term (- 1) ^ n * [n / 2 ^ n)
-1/2,2/4,-3/8,4/16,-5/32,6/64,.

Observe the following group of data and fill in the appropriate number on the horizontal line according to the rule: - 5, - 2,1,4_ 10, the number is 37?

（37+5）/3=12