解：?$(1)$?這組單項(xiàng)式的系數(shù)依次為?$-1$?，?$3$?，?$-5$?，?$7$?，···，?$-37$?，?$39$?，···
系數(shù)為奇數(shù)且奇次項(xiàng)系數(shù)為負(fù)數(shù)，偶次項(xiàng)系數(shù)為正數(shù)
故單項(xiàng)式的系數(shù)的符號(hào)是?$(-1)^n$?，系數(shù)的絕對(duì)值的規(guī)律是?$1$?，?$3$?，?$5$?，?$7$?，···，?$2n-1$?，···
?$(2)$?這組單項(xiàng)式的次數(shù)的規(guī)律是從?$1$?開始的連續(xù)自然數(shù)
?$(3)$?第?$n$?個(gè)單項(xiàng)式是?$(-1)^n(2n-1)x^{n}$?
?$(4)$?第?$2023$?個(gè)單項(xiàng)式是?$-4045x^{2023}$?，第?$2024$?個(gè)單項(xiàng)式是?$4047x^{2024}$?
