If a is the nth root of B, then - a must be the nth root of - B? OK, 100 points

If a is the nth root of B, then - a must be the nth root of - B? OK, 100 points

If eg: 2 is not necessarily the square root of 4, then - 2 must not be the square root of - 4, because the base number must be > = 0

If a and B are rational numbers, and a and B satisfy a + 2B + √ 5 = 7 + (a + b) √ 5, find the nth root of a + B

If a and B are rational numbers, and a and B satisfy a + 2B + √ 5 = 7 + (a + b) √ 5
therefore
a＋2b=7
a＋b=1
Subtract, get
b=6
Substituting a = - 5
therefore
The n-th root of a + B = 1 and the n-th root of a + B = 1

(pai-3.14) 0 power + radical 18 + (- 1 / 2) - 1 power - | 1-radical 2 | detailed process, OK, add 20 (I am satisfied)

1 + 3 radical 2-2-radical 2 + 1 = 2 radical 2

How to open quadratic root
Open the square root of an incomplete square number. (Development)

First, write the number in the root sign as a number that can be square multiplied by another number
According to the root sign m × n = root sign m * root sign N, then square the number that can be square
For example, root 20 = root 4 × 5 = root 4 × root 5 = 2 × root 5

Given that the equation M & sup2; X & sup2; - (4m-1) x + 4 = 0 has two real roots, then the value range of M

There must be two real roots
Ψ Δ≥ 0 (it is not said whether it can be the same, so it can take the equal sign)
And the coefficient before x ^ 2 should not be 0
(4m-1) ^ 2-4 * 4 * m ^ 2 ≥ 0 and m ^ 2 ≠ 0
Ψ 16m ^ 2-8m + 1-16m ^ 2 ≥ 0 and m ≠ 0
∴8m≤1
Ψ m ≤ 1 / 8 and m ≠ 0

Two hours and 40 minutes are () hours

(2 and 2 / 3) hours

1+2+3…… +99=?

Dear landlord
[positive solution]
1+2+3…… +99=（1+99）+（2+98）+.+（49+51）+50
=100×49+50
=4900+50
=4950
I wish you a happy New Year!
Remember to click adopt as a satisfactory answer, thank you for your support!

Given that x is not equal to - 1, find the range of function y = (x-3x + 2) divided by (x + 1)

X square - 3x + 2 = (x + 1) square - (5x + 5) + 6
So the original formula = x + 1-5 + 6 / (x + 1) is greater than or equal to 2 times the root sign 6-5
The value range is (double root 6-5, positive infinity)

Please help me calculate the area of this mountain. The top of the mountain is 53 meters, the bottom of the mountain is 62 meters, and the height is 80 meters

Trapezoid area = (upper low + lower bottom) times height divided by 2 = 4600 square meters = 6.9 Mu

The side area of a cylinder is 188.4dm2, and its bottom radius is 2DM. What is its height?

188.4 ÷ (2 × 3.14 × 2) = 188.4 ÷ 12.56 = 15 (decimeter) a: its height is 15 decimeters