  !"#$!"%& '(()'((* +, /01-234 5 "&+67789:;7<=> ?@9ABA7CDAE9:;7<= 3 5 − CF@GH:;7<=IJK?KLA:; '&7DFMNF:;7<=OPQ:;7<=RSQ-;7<=FMT7NF:;7<=OPAU T7NF:;7<=RSQ V&WXYAZ7XGCDZ1 [&7DFMNF=:;AE979:;7<=Q7MC\L> ]&BK6X^I;AE9S:;7<=_IOA_BAI677O7DFMQ 7`A_BAI67+AE9:;7a=_ 19&bS x c@D_# 2 7 d_# 3 11 − d_#( @&bS_@D1 x # 4 9 d x # 5 6 − d x #( %&+67789NUX7e9Cf:;SUg7?AE9S:;7<=1 &hDABAA7`A1 9&7R79NUX7e9AiAP:; @&7979NUX7e9AiAP:;T7BA( A&UX7e9AE9SNUX7e9 &UX7e9AE9S\A7 j&UX7e9AE9S7OP L19&\7 V& ' > V& V  @&\7 (c'& "] 1 (c'& "V A&hD:;[ ( OklNUX7e9AE9AP:;' &\7 5 5 1 .3 ? 3   =  ÷   j&\7 2 2 72 ? 24 = )&=N^7`ANFbQm7B@G\7A7nAP@oAE9=N^7`A>hDA7`A7G7^\7A7n AE9pX=:;@q79 *&7DFMNF:;C=Q7MC\L> "(&7DFMNF:;7gAQKLA:;7gAQ ""&+67789Ar@A79AE9S:;T7RS L1r@A79AE9*Qr@A79AE9%Q +, /01 ">9&7FM7b79IlNOXCF_=N^7Cf79Q7MC\L @&7FM7b79IlNOXCF_=N^76A7Cf79Q7MC\L '&s_CFX7jM7`gNFIFAl7CFA7CAE99SBAIt>+lNOX=N^779X= N^76A7CfIlNO_Q V&BAT\A77OfAAE97b77A7<779XIu:9MA7M7G\A7AE9JN@qV%S V >D s^\A7IBXCFA7tA9MAE97b77IJNFX S ' &CF_ AS&7b79IlNOXCF_=N^ 779X=N^76A7Cf79Q [&FS:;NFbQ ]&+v76AE97FS:;NFbQ %&+v76AE97FS:;X#9_ 9 ≠ (&AJl7O7DFMQ wx/0  +6778979JAI;I=71 '&+67NCt79JAI;I=71hy7b7>7cS77s9I67N V&+6778979IOk7zCJA1 [&\7A7nIOkCJA1 ]&+67789IOkKKgAAE9IMl7z1 %&+6778979IOk7z:M:M1 &{n7^ I67N&7@D79IOk7z:M:M1 )&?It0NCtIOk7z:M:M1 *&\7A7n I67N&AE979IOk7z:M:M1 "(&+67NCt79IOk7z7R@^AiCJACfSIOk7z7`@91 hy7b7>7cS77s9I67N ""&+67NCt79IOk7z7R@^Ai:M:MCfSIOk7z7`@91 hy7b7>7cS77s9I67N "'&+67NCtSIOk7zCJACfSKM79IOk7z:M:M1 hy7b7>7cS77s9I67N wx/0  "&+67Nu@9JAAE9S9SBA1 '&+67NCtJAMFAE9S9SBA1 V&+67789799SBA@q791 [&KOk7@q797`7nAE99SBAZAl7Al7Al7|1 ]&KOk7@q797`79AE99SBAZAl7JAAl7Z1 KOk7@q79AE9799SBACZAl7JACAl7JAC| %&KOk7@q797`@9AE99SBAZJAAl7JA| KOk7@q79AE9799SBAC1|l7JACJA7sTt|d|l7 7XtJA7s| }{~•€m•€mxw‚m ƒ„x1'(()'((* {l"1Tính giá trị biểu thức : "& … †(c]&1]‡ ' >"((ˆ 2 1 1 2 1− & 3  †""(& 4 3− 7 2 + &> 2 3 ˆ 4 1− 7 5 + &> 2 3 '&  8 7 > 49 16 † 10 3 1 25 9 ˆ 2 1− & 2 ""& 4 1 25 1 5 3− &† 4 1 15 1 5 3− & V& 916 + ˆ 5 4 1 5 1− & 2 "'& 25 3 ˆ 5 1 > 3 10− ˆ 3 2 3 − [& 5 1 .(25 − & 3 ˆ 5 1 †'> 2 1− & 2 2 1 − "V&[ ' † 7 3 1 4 1 ˆ 50− ]& 3 1 3 >"*c]†"*c]> 3 1 4 "[& 25 3 ˆ 5 1 2− 1 2 1− & 3  †" '(() %& "(c]> 4 † 5 1 3 †' V &1 5 12 "]& †]& V > 16,0 † †"& '(()  1  4 1 5 1 − & &   8 1 & "(  >%[ ] † 5 4 1[ )&  †(c]† 5 3 &1 † 25 22 &ˆ  25 2 †"c()&> 8 3 †'1"' ' *&  2 1 >(c)1 5 4 †"&1 " 15 13 >V 4 3 †"1V& {l'1Tìm x , y biết: Bài 1 : Tìm x , biết : "& 5 1 +x †[#( V& 3 2 ˆV> x # 5 4 '& 1+x †%cV#†'cV [& x ˆ(c]V#' ]&" 4 3 _ˆ" 2 1 # 5 4 %& 5 2 ˆ x 5 3 # 2 1 & 12 11 − _ˆ(c']# 6 5 )& 9 4  x 72 11 − # 4 3 Bài 2 : Tìm x trong tỉ lệ thức: "&Vc)1 '_&# 4 1 1' 3 2 '& (c']_&1V# 6 5 1(c"'] V&(c("1'c]# (c]_&1(c] [&" 3 1 1(c)# 3 2 1 (c"_& ]& 15− x # x 60− %& x 2− # 25 8 x− Bài 3 : Tìm x , y , z biết : "& 3 x # 5 y CF_ˆX#†V' 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@Œs‹NF9MIGSAE9~CF>7`S71‹#„ ~F[17MJA7s_XAJ‰NF7RBAAE9J>eSIGS„K?9‰chyS IOk7z:M:MCfX>e„CySIOk7z:M:M_cAYXl~> 9Œ7`S7‹#~ @Œhy„ ⊥ _lc„ ⊥ Xl>7`S71„#„ AŒ7`S7„NFKKgAAE9‹~ ~F]17M ABCV Cl~>s{NFKIGSAE9Al7‹>K?9I;AE99{~ NnXIGS—:9MA7M{~#{—>7`S71 9Œ ADB CDE=V V @Œ ACEV C  ~9%17M ABCV AJ‹~#‹>97RBAAE9JA‹AYAl7~l{>7`S7Kq 9Œ ABD ACD=V V @Œ µ µ B C= ~917M9SBA‹~>K?9I;AE99‹NnXIGS:9MA7M#‹cK?9 I;AE99~NnXIGS{:9MA7M{#~ 9Œ7`S7‹~ŒŒ{ @Œ„NFIGSqS<9‹CF~>9„AY{™cA7`S71 ∆ = ∆OAM ONC AŒe„Tš„CJACf‹ceTš›CJAcA7`S71„#› . /01 ">9& 7 FM7b 79 IlNOXCF_=N^ 7 Cf 79 Q7MCL @& 7 FM7b 79 IlNOXCF_=N^ 76 A7Cf 79 Q7MCL '&s_CFX7jM 7` gNFIFAl 7 CFA7CAE99SBAIt>+lNOX=N^ 7  79 X= N^ 76 A7CfIlNO_Q V&BATA77OfAAE97b 7 7 A7< 7  79 XIu:9MA7M7GA7AE9JN@qV%S V >D s^A7IBXCFA7tA9MAE97b 7 7 IJNFX.  +6 7  78 9 79 JAI;I= 71 '&+6 7 NCt 79 JAI;I= 71 hy7b 7& gt; 7 cS 7 7s9I6 7 N V&+6 7  78 9 79 IOk7zCJA1 [& 7 A7nIOkCJA1 ]&+6 7  78 9IOkKKgAAE9IMl7z1 %&+6 7  78 9 79 IOk7z:M:M1 &{n 7 ^. I6 7 N&AE9 79 IOk7z:M:M1 "(&+6 7 NCt 79 IOk7z7R@^AiCJACfSIOk7z 7` @91 hy7b 7& gt; 7 cS 7 7s9I6 7 N ""&+6 7 NCt 79 IOk7z7R@^Ai:M:MCfSIOk7z 7` @91 hy7b 7& gt; 7 cS 7 7s9I6 7 N "'&+6 7 NCtSIOk7zCJACfSKM 79 IOk7z:M:M1 hy7b 7& gt; 7 cS 7 7s9I6 7 N wx/0