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1. √128 + √98 - √50 = √64.√2 + √49.√2 - √25.√2 = 8√2 + 7√2 - 5√2 = 10√2
2. 6√3 + 2√12 - 3√48 = 6√3 + 2√4.√3 - √4.√12 = 6√3 + 2.2.√3 - 2√4.√3 = 6√3 + 4√3 - 4√3 = 6√3
3. √200 + √32 + √50 - √8 = √100.√2 + √16.√2 + √25.√2 - √4.√2 = 10√2 + 4√2 + 5√2 - 2√2 = 17√2
4. 3√50 - √8 + √128 - 5√18 = 3√25.√2 - √4.√2 + √64.√2 - 5√9.√2 = 3.5√2 - 2√2 + 8√2 - 5.3√2 = 15√2 - 2√2 + 8√2 - 15√2 = 6√2