数学天才来解题啊啊啊啊啊啊啊啊啊
a+1/a=2 求 a^2+1/a^2 , a^2-1/a^2
参考答案:a+1/a=2,(a+1/a)^2=a^2+1/a^2+2=4
a^2+1/a^2=2
a^2+1/a^2-2=(a-1/a)^2=0,a-1/a=0
a^2-1/a^2=(a-1/a)(a+1/a)=2(a-1/a)=0
a+1/a=2 求 a^2+1/a^2 , a^2-1/a^2
参考答案:a+1/a=2,(a+1/a)^2=a^2+1/a^2+2=4
a^2+1/a^2=2
a^2+1/a^2-2=(a-1/a)^2=0,a-1/a=0
a^2-1/a^2=(a-1/a)(a+1/a)=2(a-1/a)=0