I don't know how to read most of the math expressions.
Is there anything to learn them?
In U.S. English:
This can be read many different ways. A few common ones:
This is an easier one, because it really has only one meaning, albeit with different ways of pronouncing it. Here are some common ones.
"The fifth power of seven"
"Seven raised to the fifth power" OR "Seven raised to the fifth"
"Seven to the fifth power" OR "Seven to the fifth" OR "seven to the power of five"
The last two are handy when you are raising a value to something less compact than 5.
73x+1 is "Seven to the power of three ex plus one." or "seven to the three ex plus one"