Right now on cex.io I can get 1 ETH for 895$, so ETH/USD : 895$ (1 ETH gives me 895$)
but if I sell 1 ETH I only get 773$. This is not USD/ETH : 773$. It is USD/ETH : 0.00129300 (1$ gives me 0.00129300 ETH)
TKN/ETH: 506$ does this mean 1TKN gives me 506$ worth of ETH but to know exactly how much they give me I need to know how much their ETH/USD is ?
if you are seeing it on coinmarketcap.com that thing can be considered as a similiar thing.
because coin market will only tell you about the currency that you are looking for,
when you are hitting ETH and try to find out about its marketplace and pair,
you will see it that way.
ETH/USD : mean 1 ETH worth for around xUSD.
USD/ETH : 0.001293 ETH , it mean every $1 USD you will get that much,
that is why on coinmarketcap.com you will see this :
USD/ETH : $773.
they are trying to help the traders doin the calculation,
and
TKN/ETH :it mean how much TKN in value to get 1 ETH. (you will see it if you are trying to figure out what pairs that ETH traded for and on coinmarketcap you will see something like this)
do you understand ?