1.5km=_____ Mi he____ Mm (in scientific notation)

1.5km=_____ Mi he____ Mm (in scientific notation)

1.5km = 1.5 × 10-179_____ Mi he_ 1.5×10^6___ Mm (in scientific notation)

There are about 200 million books in the collection of the National Library of China, which is indicated by scientific notation______ Book

The answer is 2 × 108

There are about 200 million books in the collection of the National Library of China, which is indicated by scientific notation______ Book

The answer is 2 × 108

How many nanometers is one meter

A nanometer to the ninth power of 10 is one meter

Is a light year about 9460.5 billion kilometers

Year, a unit of length, refers to the distance that light travels in a year, that is, about 9460 billion kilometers (or 5880 billion miles). More formally, it is defined as: in a Julian year (365.25 days, equivalent to 86400 seconds per day), in free space and the earth infinitely far away from any gravitational field or magnetic field

4504 million km = () 100 million km 384400 km = () 10000 km

4504 million km = (4504) million km
384400km = (384400km)
If you understand and solve your problem,

Is 10000 meters equal to 1000 kilometers

No

How many centimeters is 10000 mm

10 mm = 1 cm;
1000 cm

The average distance between Mars and the sun is 2279.4 million kilometers, which is equal to () billion kilometers

Answer: 2.2794

618 to the round and keep a significant number by scientific notation
A. 0.62
B.1*10^-1
C.0.6
D.0.06*10^2
I don't think ad is correct. But C doesn't conform to the form of scientific notation. A * 10 ^ n, is B correct, but I don't think it's right. Please help to analyze which is correct, and the best reason is

Use exclusion
A: 62 2 significant figures, which is obviously wrong
B: The common one is 0.1, 0.618, and the rounding is not 0.1
D: 0.06 * 10 ^ 2 equals 6, which is wrong
Let's look at the C answer. First, 0.618 is rounded twice to get 0.6. Second, 0.6 has only one significant number, 0.6 = 0.6 * 10 ^ 0, and the latter 10 ^ 0 can be omitted