(1)a³-2a =a(a²-2)=a(a-√2)(a+b√2)(2)a4-9=(a²+3)(a²-3)=(a²+3)(a+√3)(a-√3)(3)a4-4a²+4=(a2-2)²=(a+√2)²(a-√2)²还有第四题么,有的话请追问或补充.看懂的话请选...（4）a²-2√3a+3就是这么多，Thank you！（4）a²-2√3a+3=a²-2√3a+(√3)²=(a-√3)²