已知实数a、b满足（4a-b-11)²+(√ 1/3b-4a-3)=0
4a-b-11=0
1/3b-4a-3=0
a=-2.5
b=-21
a(√1-b)（√6÷ √1/a)
= a(√1-b)（√6a)
=2.5*√22*√6*2.5
=5/2√330