回答: 12.124355653 说明: 147 = #3*49# #sqrt(147)#= #sqrt(3 * 7 ^ 2)# =#sqrt(3)* 7# =12.124355653 回答: 它是 #7sqrt(3)# 说明: #sqrt(147)= SQRT(3 * 7 * 7)= 7sqrt(3)#