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     !"# $%& '(& ) %*+,-+  Đ thi c 01 trang ./    −=A !"#"$%&'()$*&$$$"+,$ "'$"-."/0&1 ./&  23.4!$ 56  =+− xx  237.4!$    =+ =+  5 yx yx  ./' 89&:"         − − −         + + +=     a aa a aa B *; < ≠≥ aa =.4!$>  ??>?  @ $.4!$"-7'7!-"-A70B< ./)5 =.!C'D.EF@8G29H!&DEI&HJK'( LM*&-"*;DEG=&A""&NLF=#"FLE="OLMPQ  =::#"FHQ=AR  =:EQGE=@8  " S="P(!T"&NLF":!0'.!CP R#"=LQ&&A".U"VWG ./0 =>(%VX"K.4 $#!WNY"Z&:"   xyyyxx yx P +++ + = BBBBBBBBBBBBBBBBBBBBBBBBBBB)RBBBBBBBBBBBBBBBBBBBBBB 12 ./    −=A !"#"$%&'()$[&$$$"+,$ "'$"-."/0&1 E@\B6@ )$"-."/0&)$*&$"+,$"'G ./&  23.4!$ 56  =+− xx  237.4!$    =+ =+  5 yx yx   "- ∆ @]@^_ `.4!$"-7'7 > @ = −  ^6    < >  @ = +  ^6 5< [,(.4!$"-7>  @   < >  @5<  "-    =+ =+  5 yx yx  ⇔    =+ =   yx y  ⇔    =+ =   x y ⇔    = =   y x [,(7.4!$"-7    = =   y x < ./' 89&:"         − − −         + + +=     a aa a aa B *; < ≠≥ aa =.4!$>  ??>?  @ $.4!$"-7'7!-"-A70B<  "-         − − −         + + +=     a aa a aa B         − − −         + + +=       a aa a aa B ( )( ) aaB −+=  aB −=   a.4!$"-7'7$ ∆ b_ "- ∆ b@?  ]  @  ??]   @?  ∆ b_ ⇔ ?_ ⇔ _B   c [$.4!$"-7BT(>@B*.d" B  ??B?  @ ⇔ ]]?  @ ⇔ ]?  @ ⇔ B@ ⇔ @e"@cc fc*cc%&(!@<@NgG ./)5 =.!C'D.EF@8G29H!&DEI&HJK'( LM*&-"*;DEG=&A""&NLF=#"FLE="OLMPQ  =::#"FHQ=AR  =:EQGE=@8  " S="P(!T"&NLF":!0'.!CP R#"=LQ&&A".U"VWG  "-  ∠ E=F@  -"AR"Oh.!C ( ∠ Q=F@  < iP"- ∠ QHF@   :#"FHQ="- ∠ Q=F? ∠ QHF@  ?  @\  G ⇒ :#"FHQ=:#"ARG  QjY( ∆ EHQkKP*; ∆ E=FGT ⇒  AB AD AC AI = ⇒ EQGE=@EHGEF ⇒ EQGE=@  R G8@8  < " QjY( ∆ ELQkKP*; ∆ E=LG DH M M H E O B C ⇒  AM AD AC AM =  ⇒ EL  @E=GEQ ⇒ ELR&(R.!CPR #"=LQEL*&-"*;LF%&(!'.!CP R#"=LQ&&A".UFL"VWG ./0 =>(%VX"K.4 $#!WNY"Z&:"   xyyyxx yx P +++ + = [$>(_T#KlFYU:"=m"%VK.4  ba ab + ≤ "-   ^  5 5 yxyxx yxx + = ++ ≤+   ^  5 5 xyxyy xyy + = ++ ≤+ f*"- 5 5  5 55 5 = + + ≥ +++ + = yx yx xyyyxx yx P Q-2MM yx xyy yxx P =⇔    += += ⇔= 5 5 5 5 < Giáo viên: Phan Duy Thanh – THCS Dị Nậu – Tam Nông – Phú Thọ . xyyyxx yx P ++ + + = [$>(_T#KlFYU:"=m"%VK.4  ba ab + ≤ "-   ^  5 5 yxyxx yxx + = ++ +   ^  5 5 xyxyy xyy + = ++ + f*"- 5 5  . xyyyxx yx P ++ + + = [$>(_T#KlFYU:"=m"%VK.4  ba ab + ≤ "-   ^  5 5 yxyxx yxx + = ++ +   ^  5 5 xyxyy xyy + = ++ + f*"- 5 5  5 55 5 = + + ≥ ++ + + = yx yx xyyyxx yx P Q-2MM yx xyy yxx P =⇔    += += ⇔= 5 5 5 5 < Giáo viên: Phan Duy Thanh – THCS Dị Nậu – Tam Nông – Phú Thọ . "-         − − −         + + +=     a aa a aa B         − − −         + + +=       a aa a aa B ( )( ) aaB +=  aB −=   a.4!$"-7'7$ ∆ b_ "- ∆ b@?  ]  @  ??]   @?  ∆ b_ ⇔ ?_ ⇔ _B   c [$.4!$"-7BT(>@B*.d" B  ??B?  @ ⇔ ]]?  @ ⇔ ]?  @ ⇔ B@ ⇔ @e"@cc fc*cc%&(!@<@NgG ./)5 =.!C'D.EF@8G29H!&DEI&HJK'( LM*&-"*;DEG=&A""&NLF=#"FLE="OLMPQ  =::#"FHQ=AR  =:EQGE=@8  " S="P(!T"&NLF":!0'.!CP R#"=LQ&&A".U"VWG 

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