They first defeated the Persian fleet at Salamis which removed the Persian amphibious threat to their cities and allowed them to send out the armies being held at home to defend them. It also meant that Persia could not feed its army without protection of its supply fleet, and it had to send half it's army home.
The combined armies then defeated the army of Persia and it's Greek allies at Plataia, and simultaneously defeated the rump of the Persian fleet at Mycale.
bykilling them
Persia did not conquer Greece. Persia attempted to conquer Greece but the invasion was repelled. Earlier, Greeks had fought against Persia in the Ionian Revolt, and the Persian invasion was intended as retribution for the violation of Persian temples.
what did persia take away from the greeks
Persia was a country, Greeks are a nationality. There is no meaningful ratio.
It was the persia
another name for persia is greeks.
Many Greeks stated that Greece was more advanced than Persia.
Philip II of Macedon planned an invasion to conquer Persia but was murdered shortly before the invasion began.
against the Greeks because he was the king of Persia
By the southern city-states banding together, establishing a sound strategy, providing coherent leadership and getting together effective navies and land forces.
Persia
480 BCE.