3(根号3+根号2)-2(根号3+根号5)
= 3根号3+3根号2-2根号3-2根号5
= 根号3+3根号2-2根号5
= 1.732 + 3*1.414 - 2*2.236
= 1.732 + 4.242 -4.472
≈ 1.50