已知x^1/2+x^-1/2=3则x+1/x=
问题描述:
已知x^1/2+x^-1/2=3则x+1/x=
答
x^1/2+x^-1/2=3 平方
x+1/x=7
已知x^1/2+x^-1/2=3则x+1/x=
x^1/2+x^-1/2=3 平方
x+1/x=7