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Chương II Bài 4 Một số bài toán về đại lượng tỉ lệ nghịch

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(  .(  !"#$ %#&'& 01&&2344 (5 67&&8234 49:;54;8 <=$><9?,@ =$AB ( C8>D   , .     (  E .  F&234 G@@; G@#;    ,  B  .  .H H +≠ .I   Kin thc liên môn Ton - Vt l:     JK< JK<           .   ⇒ LM=$A=$><N&&@ E5J KN&&234@    , O>P      , , , I+    , E #) C8  (  .   , .   =$><.,@ $A    ,  ⇒ =       .   ⇒ Q=$5N>1R;S 1";':T>1U;V5 :8   ( .,.I .(,.-  ⇒ W=,4;<=$><X&&2 344-5  !"#$ %#&'& ( *+,-./010123./0 4 12 15+6 +7+6 89:; < =. >?1 ;@A+ B*+ 1/+C ,D+6 12 E?+;F1CBG+6+CH9(-;CI +C:; CJ+ ;C+C 1K+6 >?1 ;@J+6  +60L ,- ;CI CH ;@J+6 3 +60L ,- ;CI BH ;@J+6  +60L ,- ;CI ;M ;@J+6  +60( &N .O ,- 12.:0./0P ( C8>D $18*(>YTP#, . !16CW') !16CW'( !1*6CW'+ !1)6CW' 67>Z189:;>YB F&234 G@@;  C8>D    ,   , .   G@#;  B  .   (  E .   .H H +≠ .I   Kin thc liên môn Ton - Vt l:  !"#$ %#&'& ( ( C8>D $18*(>YTP#, . !16CW') !16CW'( !1*6CW'+ !1)6CW' 67>Z189:;>YB F&234 G@@;  C8>D    ,   , .   G@#;  B  .   (  E .   .H H +≠ .I   Kin thc liên môn Ton - Vt l: LM#$>Y)1@  , , ,   * ) >YE  , , , [\   * ) ∈  ] ] ] *(   * )  = ) .( .+ .   * )    ) *    . . .     ) ( +   x ⇒  !"#$ %#&'& ( ( $18*(>YTP#, . !16CW') !16CW'( !1*6CW'+ !1)6CW' 67>Z189:;>YB F&234 G@@;  C8>D    ,   , .   G@#;  B  .   (  E .   .H H +≠ .I   Kin thc liên môn Ton - Vt l: LM#$>Y)1@  , , ,   * ) >YE  , , , [\   * ) ∈  ] ] ] *(   * )  = ) .( .+ .   * )    ) *    . . .     ) ( +   x ⇒ CQR  .    .  C2 .I[4; <X;=<   [4;   * ) , , ,x x x x < )E(E+E      E E E ) ( +    * ) , , ,x x x x ;=<CX  !"#$ %#&'& ( ( $18*(>YTP#, . !16CW') !16CW'( !1*6CW'+ !1)6CW' 67>Z189:;>YB F&234 G@@;  C8>D    ,   , .   G@#;  B  .   (  E .   .H H +≠ .I   Kin thc liên môn Ton - Vt l: CQR  .    .  C2 .I[4; <X;=<   P  9   ,,^  6V  94>$:_ ^,94'? ,^ E 9,^ ;=   .  9 . ^  .  .9 ^ 9  !"#$ %#&'& ( ( $18*(>YTP#, . !16CW') !16CW'( !1*6CW'+ !1)6CW' 67>Z189:;>YB F&234 G@@;  C8>D    ,   , .   G@#;  B  .   (  E .   .H H +≠ .I   Kin thc liên môn Ton - Vt l: CQR  .    .  C2 .I[4; <X;=<   68 <;O&BWX#B x 1 2 4 5 8 y 120 60 30 24 12  x 2 3 4 5 6 y 30 20 15 12,5 10 9 > 8X  +. (+.) *+.- ).`  9O&X  *+.* +.) -.( + - ,- ≠ 01&&234< = $ )-O>P 4 * 5 - a  67 4&&8234<=$ (-O>P#b49:;5B STSU /FYcY;S1Y d#;e /G>Cf,+,HLg -,(,hHC . !"#$ %#&'& 01&&23 4  4  (5 67&&823 4   4 9:;5 4; 8 <=$><9?,@ =$AB ( C8>D . ,- ≠ 01&&23 4 < = $ )-O>P 4  * 5 - a  67  4 &&823 4 <=$ (-O>P#b 4 9:;5B STSU /FYcY;S1Y d#;e.    .  C2 .I [4;  <X;=<   68 <;O&BWX#B x 1 2 4 5 8 y 120 60 30 24 12  x 2 3 4 5 6 y 30

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