a^2+b^2=(a+b)²-2ab=1²-2x6=1-12=-11x²+1/x²=(x+1/x)²-2=3²-2=9-2=7祝学习进步,望采纳。不懂得欢迎追问。。。
a^2+b^2=(a+b)^2-2ab=1-2*6=-11x^2+1/x^2=(x+1/x)^2-2=9-2=7