1.{√(3/2)+√(2/3)-√75+4√(3/50)}除以√（4/5）乘以（-2√15）=[(√6)/2 +(√6)/3 - 5√3 + (2/5)√6]×√(5/4) ×(-2√15）=[(5/6 + 2/5)*(√6)-5√3]×(-10√3)=[(37/30)*(√6)-5√3]×(-10√3)=-37√2 +1502....