计算
1. 5√8-2√32+√50
2. √6-√3/2-√2/3
3. (√45+√27)-(√4/3+√125)
4. (3√7+2√3)(2√3-3√7)
5. (√32-3√3)(4√2+√27)
6. (3√6-√4)²
7. (1+√2-√3)(1-√2+√3)
8. (1+√2)(1-√3)=1-√3+√2-√6
9. (2-√5)(2-√5)=4-2√5+5=9-2√5
10. (2√2+3√3)(2√2+3√3)=8+2*2√2*3√3+27=35+12√6
化简
1. (√4a-√50b)-2(√b/2+√9a)
2. √4x*(√3x/2-√x/6)
3. (x√y-y√x)÷√xy