No you can't. The lower level 50 OPS boss probably won't be able to hurt you, but the mechanics require multiple people and the mechanics can kill you. The same is said with the 55 ops, except the bosses actually will be high level enough they can fairly easily damage and kill you.
For the lower level 50 ops, I've heard some of them being possible with 2 people, but you can't get around some of them.