The distance between the moon and the earth is about 390000 km. The information of the moon obtained by the satellite is transmitted back to the earth in the form of radio waves. The propagation speed of radio waves is 3 × 10 ∧ 5. How many seconds does it take for the satellite to transmit the information to the earth

The distance between the moon and the earth is about 390000 km. The information of the moon obtained by the satellite is transmitted back to the earth in the form of radio waves. The propagation speed of radio waves is 3 × 10 ∧ 5. How many seconds does it take for the satellite to transmit the information to the earth

t＝s／v
＝3.9x10＾5km／3x10＾5Km／s
＝1.3s

The transmitted radio waves reached the moon and returned to the earth for 2.56s. What is the unit of S

S in 2.56s is the unit of time in seconds

If the power of 9A to the X, the power of B to the 7 and the power of - 7a to the 3x-4, the power of B to the 7 are of the same kind, then x =?
fast

Lie equation
x=3x-4
-2x=-4
x=2

Take (a-b) as a whole and merge the similar items of 3 (a-b) ^ 2-4 (a-b) + 5 (B-A) ^ 2-6 (B-A) to get []
You copied the wrong question! How did you change inside! Downstairs, you copy upstairs! The first part of your merging similar items is to copy the original title!
I made it

3(a-b)^2-4(a-b)+5(b-a)^2-6(b-a)
=3(a-b)^2-4(a-b)+5(a-b)^2+6(a-b)
=8(a-b)^2+2(a-b)