The volume of the earth is 9.05x10 cubic kilometers, the radius of the sun is the second power of the earth's 10, the volume of the sun!

The volume of the earth is 9.05x10 cubic kilometers, the radius of the sun is the second power of the earth's 10, the volume of the sun!

Sphere volume formula: v = 4 / 3 * pi * R ^ 3
Where R is the radius of the sphere
Because the radius of the sun is 10 ^ 12 times that of the earth, the volume of the sun is (10 ^ 12) ^ 3 = 10 ^ 36 times that of the earth
Solar volume = 9.05 * 10 ^ 11 * 10 ^ 36 = 9.05 * 10 ^ 47 cubic kilometers

Let R be the volume radius of the sphere to the fourth power of 0.8

V=3/4πr^3
8π=3/4πr^3
r^3=8*4/3=32/3
r=2.2

The volume formula of the ball is: the volume of the ball = three fourths of π r to the third power
Two small balls with a radius of 5.2 cm are melted into a big iron ball. It is known that each cubic meter of iron weighs 7.8 g, and there is one percent loss of iron in the melting process. The mass of the big iron ball is calculated by computer

First of all, the condition in your question is wrong. The density of iron is 7.8g/cm;
5.2*5.2*5.2*3.14*2-5.2*5.2*5.2*3.14*2*0.01=874g