第9期 命题、定理与证明-2018-2019学年八年级上册数学【中学生理化报】华东师大

!"#$%&' ( !"#"$% ) %&$'(%&$! *& !"#$%&' ( !)#"*% ) !"#$ ! ! " "#$"$" #$ !" #" $" %" &" #" '"!"#$%&'( $)*+,-.$%/0%" (" 1" )"23&4#+! *+ ,"!"#" -"5!6!"#$789:7;,-.$7<=7>?@< A#$789:7B;CD<A.$7<=7E" F$6!"G$%HI/ .;,-.G$%J/KL%M? @<AG$%HI/ .E;CD<A.G$%J/KL%E+ F&6!"G$%N<O%;,-PQHR<S%M ?@<TG$%N<O%E;CD<APQHR<S%E+ F'6!"G$7KU;,-.G$7HV7KUM ?@<AG$7KUE;CD<A.G$7HV7KUE+ /+!/WXY;LZ[!-(!H7> " /WXY+LZ[\.$]7^H_`/ ,;a`/ (;b.$]7^Hc`/ !/> $/WXY;LZ[F0 $ ! 61 $ ! 2 .> #/1XY" "%$"$&''%&'() !" %" $" 3" &" #" '" de>fg7KU;G:hijMG:hij;kl 7KUMdeMUmno" (" " !""#$;Fdep # ##%" 1 #& 2 /.!"F:7]7^HG=7Jqp " #! 2 #&;Fdep $ #! 1 #&%" 2 #&%$ 2 /.!"FUrstp $ $%&$ <:7]7^" )" % #! 2 #$Fdep; $ %"%&'Fkl7KU;G:hijp" $ #" 2 #"&'FG:hij;kl7KUp" " #& 2 #"Fdep; $ #& 2 #"&'FUmnop" $ &"%$'Fkl7KU;G:hijp" "%$" *$+ !" %" $" 3" &" #" '"W;G$:7JV" ("F!p!"#$%/uS%;,-.$%vwixy" WXYM F$p!"G$7KU;,-.G$7&#z<{|7" 1XYM F&p!"G$U_]7^w#$7KU; ,-.G$ ]7^}U"WXY" )" " &(;$( ~�<#%#$+#%$" Hi~h+ $ #%#$ 2 $#(#$+#%$" 2 $#($"" " #($" <$#$( H�7+ $ #( 2 #($" 0 #(#$" " #%$" <$%#$ H�7+ $ #% 2 #%$" 0 #%#$ 2 $#($" 0 $#(#$ 2 $F#($" 0 #(#$62 $#(" ,"#! 1 #$ 2 #& 1 !-.!" ��!�[�C #") " #&<$&"* H�7F�7Hz�!+ $ #& 2 ##"* + #"&*"]7^H#$�7U9� P&K�HG$k7HI6" " %&%$"Fde!; $#%&"+#$"&2!-.!"G:hij;f�k7JV!" $ #! 1 #$ 2 #%&" 1 #"&* 1 #$"& 1 #&"* 2 #& 1 !-.!FUmno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`ab;# !.# Dcd# efHI!gJ hi5J6 - % . 87- $ , -- % . $ "7jklmAno Dcd# hipJ- $ , -- % -:- , -;76 - % - 87- , - % "7j k - $ , --% "#jklmAnoDcd# !/# 1qD457!!"% &#7 rs"! % "$7"& % "'7,.'&' t .7 u ()'&' t )# vm!gJ!