a乘（a减1）乘(a减2)乘(a减3)=360怎么解
问题描述：
a乘（a减1）乘(a减2)乘(a减3)=360怎么解
答
a(a-1)(a-2)(a-3)=360[a(a-3)][(a-1)(a-2)]=360(a²-3a)(a²-3a+2)=360(a²-3a)²+2(a²-3a)-360=0(a²-3a+20)(a²-3a-18)=0(a²-3a+20)(a-6)(a+3)=0(a²-3a+20=0无实数根)∴a=...