is this area formulae 2πr2+2πrh equal to 2xπxr2+2xπxrxh?

　
Yes (assuming x's mean multiplication)
Also, use ^ to denote exponentiation:
x^2 = x squared = x²
x^3 = x cubed = x³
etc.....

Usually it's not necessary to use multiplication signs.
So if you find 2 variables (or a constant and variable) with no symbols between them, then use multiplication:

2πr² + 2πrh = 2×π×r² + 2×π×r×h

If you are using x to represent multiplication then yes. BTW: Denote exponents using the caret symbol. x² = x^2, not x2

yes
2πr^2+2πrh equal to 2*π*r^2+2*π*r*h