Use calculator - answer correct to 3 places.

2√11 - 3√2 + 15√10 + 5√5 = How would I punch this into calculator? If I type it in as it is, it says "domain error"

(3√17 + 2√15)/5√7 = How to punch this in calc.

2/17 + 3/19 - 1/7 = How to punch this in calc. Do I need to bracket each fraction or type as it is?

Thanks for helping!