1.下列式子在复数平面上各具有怎样的意义?-|||-(1) |z|leqslant 2 ,-|||-(2) |z-a|=|z-b| (a,b为复常数),-|||-(3) gt dfrac (1)(2) ,-|||-(4) |z|+Rezleqslant 1 ,-|||-(5) alpha lt arcsin dfrac (3)(3)lt beta ,lt Rezlt b (α,β,a和b为实常数),-|||-(6) lt arccos dfrac (x-i)(z+i)lt dfrac (pi )(4),-|||-(7) |dfrac (z-1)(z+1)|leqslant 1 --|||-(8) (-dfrac (1)(z))=2 --|||-(9) (z)^2=(a)^2 (a是实常数),-|||-(10) (|{z)_(1)+(z)_(2)|}^2+(|{z)_(1)-(z)_(2)|}^2=2(|z|)^2+2(|z|)^2 -