√(12)-[√(1/3)-√(1/27)]=2√3-(1/3√3- 1/9√3)=16/9 √3
[10√(1/5)-1/2√(20)]-[(5/4)√(4/5)-3/7√245
=10*1/5√5-1/2*2√5-(5/4*2/5√5-3/7*7√5)
=2√5-√5-5/2√5
= -3/2√5
√(12)-[√(1/3)-√(1/27)]=2√3-(1/3√3- 1/9√3)=16/9 √3
[10√(1/5)-1/2√(20)]-[(5/4)√(4/5)-3/7√245
=10*1/5√5-1/2*2√5-(5/4*2/5√5-3/7*7√5)
=2√5-√5-5/2√5
= -3/2√5