No. You roll against three different DC (set by your own ability score) for one single skill role. It has nothing to do with the skill challenge attempt from D&D 4e. You have to role under your ability score. If you role too high, you substract the difference from your skill points. If your skill points fall below to zero, you fail your skill check.
So you must roll under your ability score + skill three times for the three different abilities and skills as applied. Am I getting this right?