第12期 尺规作图-2018-2019学年八年级上册数学【中学生理化报】华东师大

!"#$%&' ( !"#"$% ) !!""#!#!$$%$"&'$%& !"#%("!!"#%$"$ ! $" ) ("* ! $" ) (&* " &+ # $$"$ ! (" ) (+* ! #("+ '()*+,+-% ! !+"( # &'#% ! !&"+ # &'# ( &'# # )*#% ! +""&'% %% + & ' , $" - ( . $ ! !" " !#$%$!&'&!#$%$" #$%& +% ,% $% ,% -% .% &% /% '% /. +$$' 01234% . + % & $ ' " /% /. $$!%&$ 012+% & ' $ % . $ !#$%$#&'&!#$%$( #$%& +% 0% $% !"#% -% +*% &% )*#% '%5+67./. +% % "$ & ' , . . + 8$9 %# ) %$ ) #'% :;<% /%5+912= $ /. $1>? ' % # . $ $ 8$9 " !' ) 1*#$ ! !'%# / !%&' ) +1*# 2 1*# # +**#% " %$$&$ #@'!'%&$!%&' A"#3$ ! !$%& # + $ !'%&$!$&% # + $ !%&'* ! !$%& ( !$&% ) + $ 8!'%& ( !%&'9) '*#* ! !%$& # +1*# 3 '*# # +-*#% !#$% '() +% ,% $% &*#% -%7.<% &%8+9/.1>? % ' & " # 8$9 BCA34 "# $ $"$ BCAD+!"$& # !'$&% '%8+97.<E 8$9FG &$* " !' # /*#H!% # &*#H ! !'&% # 1*#% " $" ' %& AI*"#3H ! !% ) !$&% # &*#% ! !$&% ) + $ !'&%* % &$ "#!'&%* !#$% *+( ,-./012,345 +% 0% $% ,% -% .% &% 0% '% ,% /% ,% 4% .% 1% 0% /3 3 !"#$%&' ( !"#"$% ) !"#$%&'()*+ !"!"#$%&'()*" #$% &% ''% !"#% '&% ''$% ,-./01'2345 '(% +, '-!" ./012% , ' # $ "! % ')% 3,4% '*"5'63,47 8&9!&'( ) !*+$ + ',$!:!&'( , !#+-" '-"5'93,47 5&9 " !# + ($!-!! + !$!- # !#-! + -$!" " -" ;<!#-!- ! !#-" . ($!" $ !#-" . !#/ ! "- . "01 " "# # "--#% # -%-"% # "%- ! "#"% !"-"%1 '.%5'93,47 5&93,47 % &2 . (+-!2&( . !+(&-&( . (&- ! "&(2 !"(&+1 5(9+, &-= 0! >?@AB"%0! !""!0- $ !%!0 . !"0!-0% . !"-!% . !"1 " !0!- 3 !!#" . ',$!- ! !#!- ) !%!# . ',$!-C % D= -! >EF1G1 " !- . !"- ! !% . !-1 ! #% . #-1 ! #- . !"1 " % ! -# , & 6789:;!"!#$%"!!"!!&&&&&&&&&&&&&&&&&<=;>?@A<=B BC;>?DAEFGHIJK>LM %! N '"#' OC;PQDRSTUVW ' NX%'!!'"Y >?Z6K[;>?DAEF\]KM %$( N )%#'%!*X+'!*'!Y ./ / $$ !"#$%&'('&)*+,-./0 123 4!"#$567809:;<=>?@#$! !"#$%&'() * ! !! !" "#$%&' !#"(" # !)*+,&- $*%* . $ & ! ' "*% & " ( !) " " ! " / // / +,-!"#$%&'()*+&',-./01 '2 "* + " 34-.'2 !* 56'278'21 9:+ " 1;4-.'2 !('2 " ;<=14>?7 8'21@! .-!" #*0"1,2& *+3 4#152& *+ 6789: *, & "*,- & !3 4$15&' *, 69: *. & !! ;&' *- <=>+&- $*&- ., <=>+& - %! " # * +. , - / /0-!"#$%&'()*+,"-./012 "#$34!"#$5&')*(+63$"#780 169$"#:;