(1)2倍(根号3+根号7)-10倍根号7
=2√3+2√7-10√7
=2√3-8√7
2.根号5-3(根号5-根号2)+|根号2-根号5|
=√5-3√5+3√2+√5-√2
=√5-3√5+√5+3√2-√2
=-√5+2√2
3.根号(1/3)^2+三次根号(1-5/9)(1/3-1)
=1/3+³√(4/9x2/3)
=1/3+³√8/27
=1/3+2/3
=1
(1)2倍(根号3+根号7)-10倍根号7
=2√3+2√7-10√7
=2√3-8√7
2.根号5-3(根号5-根号2)+|根号2-根号5|
=√5-3√5+3√2+√5-√2
=√5-3√5+√5+3√2-√2
=-√5+2√2
3.根号(1/3)^2+三次根号(1-5/9)(1/3-1)
=1/3+³√(4/9x2/3)
=1/3+³√8/27
=1/3+2/3
=1