`2^x+2^-x=3,(2^x+2^-x)^2=9,2^2x+2^-2x+2=4^x+1/4^x+2=94^x+1/4^x=710^m=2,10^n=310^3m-n/210^3m-n/2=2^3/滚颤3^0.5=8/晌祥3 *3^0.5a^1/2+a^-1/2=3 (a^1/2+a^-1/2)^2=a+a^-1+2=3^2a+a^-1=7(a+a^-1)^2=a^2+a^-2+2=7^2a^2+a^-2=47嘿嘿 做宴备搏好了