casio calculator boton 0 boton 1 boton 2 boton 3 boton 4 boton 5 boton 6 boton 7 boton 8 boton 9 boton dot boton sumar boton dot boton multiplicar boton dividir boton raiz boton porcentaje boton dot boton ac boton c boton signo boton memory record boton memory restar boton memory sumar boton off