行车记录仪高温不开机:a^2 +3a+1=0 (1)1+1/a (2)a^2 +1/a^2

填空：a^3-a^2+a-1= -( )+(a+1) 数学:a^2-3a+1=0 a^2+1/a^2=? a^2+3a+1=0,则a^2+a^2/1=？ a^2-3a+1=0求a^2+1/a^2的值 a^2-3a+1=0,求a+1/a的值? a^2+a-1=0,求a^3+2a^2-9的值 a *a-3a= -1 请问a是多少? 1×A = A a^2 +3a+1=0 (1)1+1/a (2)a^2 +1/a^2 (a+1)(a-2)(a-3)(a-6)-a^2(a+5)^2