If the sum of the square y of the monomial MX and the-n-1 power y of NX is zero, we can find the value of M fast

If the sum of the square y of the monomial MX and the-n-1 power y of NX is zero, we can find the value of M fast

From the known
m+n=0
-n-1=2
The solution is n = - 3, M = 3
m/n=-1

It is known that the radius of the sun is 7 * 10 to the eighth power and the radius of the earth is 6.4 * 10 to the sixth power. How many times is the volume of the sun larger than that of the earth?
PI 3.14, the results retain two significant figures urgent! Big brother and big sister, help!

The sixth power of 1.31 * 10
V = 4 / 3 the third power of R

It is known that the radius of the sun is 6.96x10 cubic meters, and the radius of the earth is 6.4x10 cubic meters. How many times the volume of the sun is that of the earth?
Keep two significant numbers, π = 3.14
Please answer quickly. I want something simple and easy to understand,

The sphere volume formula v = 4 / 3 π R ^ 3 (R is the radius of the sphere)
The sun and the earth are approximated as spheres
V Yang / V Di = (r Yang / R DI) ^ 3 ≈ 1.29x10 ^ 7
So the volume of the sun is 1.29x10 ^ 7 times that of the earth