2.2 等差数列（练案一）2020年高中同步教与学数学（人教B版必修5）

书书书 !"# ! $ !! % !!! ! ! " # $ !!!!" ! !"#$ ! ! %& " ' " %& ! !"#$()* !! !"#$% ! " # " &'#( $ # ) ! "" # " * $ !! % #$ '#( $ &"#$% %$ '#( "$ &"#$% &$ +"#$% '$ ,-./* (! 01"#$% ! " # " &23'4 " # )"*(# # )5&'#( $ !! % #$( %$" &$*( '$*" "! ! +, -" ( # +, -" $ ( % *! %# +, -" $ ( % .!! % 6"#$% ! ) % &7( $ !! % #$/ 8 *" !!! %$+, -" / &$+, -( / ! '$0 0! 9 & # ' $ & " ' % :;<=>?$ # @5AB6"#$% # )'# $) ! 1! "#$% ! " # " &C3( " ! # '#( $ # DE'4F/*"#$ %&23'4GH&* $ !! % #$" #.! )" ! .#$ %$" # )#$." ! *$ &$" ! )" # * $ #*! % $ '$" # )" ! .#$ 2! C3( *(0 &"#$% # IJ !3 3KLM(N$ # )'# $ &O7PQ* ! /! 9"#$% ! " # " F & $ ! % 01 " ! )4 # " 5 )*( # R $ S " !0 ' $ ( % 01 " " ." 1 )!4 # " 0 ." 4 )(0 # R $! 4! !$% ! " # " TU " #.! ) "" # .( " $ # # # $ %# V " ! )3 # ) " /3 ) !!!! ! 5! 01$% ! " # " ("#$% # V " 1 )!! # " 4 )1 # ) " # ) !!!! ! !3! 01 ( $ ! % )( # ( $ #.! % ) ( ( $ # % .! ( $ # # # . %# R ( $ !3! % &7 ! !!! WXYZ-[\IZ]K^_Y !33 ` # ab 3!/6 # 01Z c[\* !0!!6 # Z][\* (26 # defZghiZ]& Yj* $ !! % #$!133 ` %$!233 ` &$!/33 ` '$!433 ` !(! "#$% ! " # " F # C3( "" # '#(k$ # !l / 3m(N $ # J / 3,no3.(p$ # )'# $ &7(qr ( !"! s"#$%tu?$B6 # u$:S( 5 # u$&vwS( "1 # Rfu$ ! !0! 01 ! " # "#! ) # " .("#$% # & # ' .*x$ # de$% ! & " # . ' ) # " *"#$%y ( !1! 01z$ ( $ % % ) ! % (槡 *( $ % % *( %# $% ! " # " TU " ! )! # ! " #.! )* ( *! $ " # %# # # # $ # R$% ! " # " &23'4 ! ) ! ) !" !!! #$ !!!!!!!!!!!!!!!!!!!!!!! %&'()*+ ! ,- " . # /0 !2! {s|}~� $ 7&' % ����(^� 433 � # 9� * �>�� ���m{�� ! �����Dw��� & �s���( /43 � # �>���( /23 � # ���� # ^q�s�)��o ���m�r (3 � # �^��r/bi 003 � ' ���s�. ���& /18 �� ! ������s|f�}~� #  ¡¢ s�����£¤¥r ( ' ! %& ! !"#$(+, !! 9"#$% ! " # " F # " 1 ." 2 ." / ." 4 ." 5 )013 # ) " " ." !! &7 ( $ !! % #$01 %$/1 &$!43 '$"33 (!".*)() * " # ) # * 6"#$%& $ !! % #$ ¦§/¨©ª« %$ ¨©/¦§ª« &$ ¦©ª« '$ ¬/¦§­/¨©ª« "! 9 & +,- F # + * , * - u®¯6"#$% # )¯ , "i $ !! % #$"39 %$239 &$539 '$ /°±² 0! 01 . S (# &"#F3* 0 # (. S # &"#F3* 1 # ) . S # &"#F3* $ !! % #$( %$" &$2 '$5 1! 9"#$% ! " # " F # " " # " 5 *