Question

根号3,X+2,根号27成等比数列,则X等于

Answer 1

因为根号3,X+2,根号27成等比数列 所以(X+2)^2=根号3*根号27 (X+2)^2=根号3*3根号3 (X+2)^2=9 X+2=正负3 X=1或X=-5