If the sum of N + 3 square of 5x and M + 1 square of - 2XY is a monomial, then 2m-n =?

If the sum of N + 3 square of 5x and M + 1 square of - 2XY is a monomial, then 2m-n =?

The sum of the two monomials 5x ^ (n + 3) y ^ 5 and - 2XY ^ (M + 1) is a monomial, which indicates that the two monomials can be combined into the same category, then the times of the unknowns X and y should be equal, so m + 1 = 5, n + 3 = 1, so m = 4, n = - 2, then 2m-n = 2 × 4 - (- 2) = 8 + 2 = 10

How many cubic meters per kilogram is 3050 cubic centimeters per gram

Each conversion is 3050 cubic centimeter = 3.05 * 10 ^ - 3 cubic meter
1g = 1 * 10 ^ - 3kg
3050 cm3 / g = 3.05 * 10 ^ - 3 / 1 * 10 ^ - 3 = 3.05 m3 / kg

The fruit shop sells a batch of apples. It sells 20% in the first day, 20 kg in the second day, 80% in the last two days and 80% in the third day. How many kg are these apples

Let the total number be y
The first day sold 20% y, the second day sold 20 kg, the third day sold (0.2y + 20) 0.8, the last remaining 80 kg, a dollar equation is 0.2y + 20 + (0.2y + 20) 0.8 + 80 = y solution y = 181.25

If 2A = 3b, a is not equal to 0, B is not equal to 0, then (2a ^ 2) / (3b ^ 2) =?

1

If the principal value of the complex z = AI + A ^ 2-1 is 3 / 2 π, then what is the real number a

The main value of Z = AI + A ^ 2-1 is 3 / 2 π
The point corresponding to Z is on the negative half axis of the imaginary axis,
Then Z is a pure imaginary number and the imaginary part is negative,
That is, a ^ 2-1 = 0, and a

The speed of a car is 22% faster than that of a bus. What percentage of the speed of a car is that of a bus?
Right now, before nine o'clock

1+22%=122%
A: 122%

The product of two different natural numbers is 56 and the sum is 18. What is the difference between the two numbers

One is 14, one is 4, and the difference is 10

Expressed as a times 10 to the nth power
00012 (where 1 is greater than or equal to a and a is less than 10)

1.2 times 10 to the - 4th power

The regulations of a park on the purchase of tickets for group tours are as follows: the number of people who buy tickets is less than 50, 51-100, and more than 100. The ticket price for each person is 12 yuan and 10 yuan 8 yuan. Now there are two tourist groups A and B. if they buy tickets separately, they will pay a total of 1142 yuan. If they buy tickets together as a group, they will only pay a total of 864 yuan. Q: how many people are there in each group?

If there are X members in group A, then there are (108-x) members in group B, 12x + (108-x) × 10 = 1142, 12x + 1080-10x = 1142, 2x + 1080 = 1

Let a and B be constants, and the limit of (AX ^ 2 + BX + 1) ^ (1 / 2) - X be 1 when x tends to positive infinity, then what is a + B equal to

When x → infinity, the denominator of the above formula is a finite value