1. 75÷(巧燃1+1/4)=60(孝哗虚棵)杨树/(1+1/4)=柳芦饥树2.75×(1-1/5)=60(棵)杨树*(1-1/5)=柳树
1. 75÷(培友脊1+1/配渗4)=75÷5/4=60(棵)2.75×(1-1/5)=75×4/告散5=60(棵)