!"# $%& '(& ) %*+,-+ Đ thi c 01 trang ./ −=A !"#"$%&'()$*&$$$"+,$ "'$"-."/0&1 ./& 23.4!$ 56 =+− xx 237.4!$ =+ =+ 5 yx yx ./' 89&:" − − − + + += a aa a aa B *; < ≠≥ aa =.4!$> ??>? @ $.4!$"-7'7!-"-A70B< ./)5 =.!C'D.EF@8G29H!&DEI&HJK'( LM*&-"*;DEG=&A""&NLF=#"FLE="OLMPQ =::#"FHQ=AR =:EQGE=@8 " S="P(!T"&NLF":!0'.!CP R#"=LQ&&A".U"VWG ./0 =>(%VX"K.4 $#!WNY"Z&:" xyyyxx yx P +++ + = BBBBBBBBBBBBBBBBBBBBBBBBBBB)RBBBBBBBBBBBBBBBBBBBBBB 12 ./ −=A !"#"$%&'()$[&$$$"+,$ "'$"-."/0&1 E@\B6@ )$"-."/0&)$*&$"+,$"'G ./& 23.4!$ 56 =+− xx 237.4!$ =+ =+ 5 yx yx "- ∆ @]@^_ `.4!$"-7'7 > @ = − ^6 < > @ = + ^6 5< [,(.4!$"-7> @ < > @5< "- =+ =+ 5 yx yx ⇔ =+ = yx y ⇔ =+ = x y ⇔ = = y x [,(7.4!$"-7 = = y x < ./' 89&:" − − − + + += a aa a aa B *; < ≠≥ aa =.4!$> ??>? @ $.4!$"-7'7!-"-A70B< "- − − − + + += a aa a aa B − − − + + += a aa a aa B ( )( ) aaB −+= aB −= a.4!$"-7'7$ ∆ b_ "- ∆ b@? ] @ ??] @? ∆ b_ ⇔ ?_ ⇔ _B c [$.4!$"-7BT(>@B*.d" B ??B? @ ⇔ ]]? @ ⇔ ]? @ ⇔ B@ ⇔ @e"@cc fc*cc%&(!@<@NgG ./)5 =.!C'D.EF@8G29H!&DEI&HJK'( LM*&-"*;DEG=&A""&NLF=#"FLE="OLMPQ =::#"FHQ=AR =:EQGE=@8 " S="P(!T"&NLF":!0'.!CP R#"=LQ&&A".U"VWG "- ∠ E=F@ -"AR"Oh.!C ( ∠ Q=F@ < iP"- ∠ QHF@ :#"FHQ="- ∠ Q=F? ∠ QHF@ ? @\ G ⇒ :#"FHQ=:#"ARG QjY( ∆ EHQkKP*; ∆ E=FGT ⇒ AB AD AC AI = ⇒ EQGE=@EHGEF ⇒ EQGE=@ R G8@8 < " QjY( ∆ ELQkKP*; ∆ E=LG DH M M H E O B C ⇒ AM AD AC AM = ⇒ EL @E=GEQ ⇒ ELR&(R.!CPR #"=LQEL*&-"*;LF%&(!'.!CP R#"=LQ&&A".UFL"VWG ./0 =>(%VX"K.4 $#!WNY"Z&:" xyyyxx yx P +++ + = [$>(_T#KlFYU:"=m"%VK.4 ba ab + ≤ "- ^ 5 5 yxyxx yxx + = ++ ≤+ ^ 5 5 xyxyy xyy + = ++ ≤+ f*"- 5 5 5 55 5 = + + ≥ +++ + = yx yx xyyyxx yx P Q-2MM yx xyy yxx P =⇔ += += ⇔= 5 5 5 5 < Giáo viên: Phan Duy Thanh – THCS Dị Nậu – Tam Nông – Phú Thọ . xyyyxx yx P ++ + + = [$>(_T#KlFYU:"=m"%VK.4 ba ab + ≤ "- ^ 5 5 yxyxx yxx + = ++ + ^ 5 5 xyxyy xyy + = ++ + f*"- 5 5 . xyyyxx yx P ++ + + = [$>(_T#KlFYU:"=m"%VK.4 ba ab + ≤ "- ^ 5 5 yxyxx yxx + = ++ + ^ 5 5 xyxyy xyy + = ++ + f*"- 5 5 5 55 5 = + + ≥ ++ + + = yx yx xyyyxx yx P Q-2MM 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 [$.4!$"-7BT(>@B*.d" B ??B? @ ⇔ ]]? @ ⇔ ]? @ ⇔ B@ ⇔ @e"@cc fc*cc%&(!@<@NgG ./)5 =.!C'D.EF@8G29H!&DEI&HJK'( LM*&-"*;DEG=&A""&NLF=#"FLE="OLMPQ =::#"FHQ=AR =:EQGE=@8 " S="P(!T"&NLF":!0'.!CP R#"=LQ&&A".U"VWG