  ! " #$%!&  ''()*+,*'-./012  Mỗi học sinh phải ghi đầy đủ tên lớp cng họ v tên vo phần phch v ghi “ Ban A, B” hay “ Ban D, SN” vo phần đầu bi lm ty theo loại lớp của mình. 3(43-*+56557 44"48494:2 ';+56557)<)=1)*-> > 49> 49>"> 2 3(?4@-*+56557 44"48492 ';+56557)<)=1)*-> 49> 49>>"2 7         x x x x− − ≤ − +       x x x x− + − − ≤  7 !"#$% &'(    )  )  mx mx x x m + + − ≥ + +  7"*+!,-.*/  01  23/2124)5'6.27289 919:.*!;6 7889<=:>&<.?#@ >4  A 5'.?!;!"  3  7 A K   −  ÷    BC  DC  &'E!" :.? !FG@7H5'I&'!" J.? I9KC  H0C  I4DL1<MC  H0C  I 79(NB"O + +A + + +3 a a a A a a + + = +  *O !PO  + + + +   3 x x x x π π     + − =  ÷  ÷      *O "O Q Q  3      +  +  + 3 +B x x x x x x x x= + − + +  RSTJ5'+/ 7:   A  A  3x x x x− + = + + +  UVW 6/66AB'  7 C'D ';+ 3 ?@ (        x x x x− − ≤ − + EF EF ⇔               x x x x x x x x  − − ≤ − +   − − ≥ − + −    )A )A ⇔   3  )  Q ) x x x x  + − ≤   − ≥   )A )A ⇔ Q 3 )  x x hay x − ≤ ≤   ≤ ≥  )A )A ⇔2QX/X) )A )A ,      x x x x− + − − ≤  YR%/X)1/Z )A )A .⇔     x x x x− + ≤ − + ⇔/  2/00  x x− Z/  2/0⇔   x x x− ≥ +  )A )A ⇔     )  )  )   [ x x hay x x x x x x + < + ≥     − ≥ − ≥ + +   )A )A ⇔   )  [ [ ) x x hay x hay x x < − ≥ −     ≤ ≥ + ≤   ⇔    x x < −   − ≤ ≤ −  ⇔/X2 )A )A   !"#$% &'(    )  )  mx mx x x m + + − ≥ + + . \4 \4DA .#$% &'(⇒/  0/0 ])D∀/ ⇔∆^42 _)⇒ `. )A )A a!#/  0/0 `)D∀/E . ⇔ /  0 /0)2/  23/2 Z) ⇔. 2/  0. 22 0)Z). )A )A  ].b∀/∈(⇔   ) ^ .  . .  ) ) m m m m − >   ∆ = − − − − + ≤  ⇔    ) ) m m m >   − + − ≤  ⇔  3 m m >   ≤  ⇔_ X3.b. )A )A  4.⇔Z)⇒ 4$ 8$1.#$% &'(⇔X X3 )A )A " *+!,-.*/  01  23/2124)5'6.27289 919:.*;6 EF 49 EF 49 .*#@ c.75'R<(4      3+ + =  )A )A B.d&'919:.* .d;65'#8WeW&' n ur 4.H7I.H  0I  `) ⇒.dH./00I.104)⇒.dH/0I10H0I4) )A )A d.c7.d4(⇔       3 A B A B A B + + + = + )A )A ⇔   3  3A B A B+ = + ⇔      A B A B+ = +  ⇔ 3H  0HI0[I  43.H  0I   ⇔ HI2AI  4)⇔ I4)1I4  A A  )A )A aI4  A A DBH4A.5H  0I  `) ⇒I4⇒.6CA/01034) )A )A aI4)DBH4⇒.6?/04) 8$1#919:.*!;6&'.6?/04) .6CA/01034) )A )A 8( 89<=:>&<.?#@ >4  A 5';!"  3  7 A K   −  ÷    EF EF 49 e:.?#df.?      x y a b + = .  4  2  5'``) )A )A   A c e a = = ⇒4  A a ⇒   [ A a c = ⇒  2  4  [ A a ⇒  2A  4) )A )A a∈.?⇒   3   Aa b + = ⇒   3   a a + = ⇒  4A⇒4A⇒43 )A )A 8$1.?    A  x y + =  )A )A 8, BC  DC  &'E!" :.?7H5'I&'!" J.? I9C  H0C  I4W<C  H0C  I EF49 EF49 H5'I&'!" J.?E     CH0C H44) CI0C I44)    )A )A     CH0C H0CI0C I4)⇒ 6'C  H0C  I4⇒C  H0C  I4Q )A )A 9( (NB"O + +A + + +3 a a a A a a + + = +  EF EF H ( ) + + +A + +3 a a a a a + + = + +A + +A +A + a a a a a + = )A )A +A .+  +A + a a a a + = )A )A  + + + a a a = = )A )A 9, *O   + + + +   3 x x x x π π     + − =  ÷  ÷     EF EF   +  + +   VT x x π   = +  ÷   )A )A    + . +    x x= − + − )A )A   + .3+  3 x x= − )A )A  + 3 x VP= = )A )A 95 I Q Q  3      +  +  + 3 +x x x x x x x x+ − + +  *O IRSTJ5'+/ EF EF B = Q Q  3     +  + . +  3 +x x x x x x x+ − − + = Q Q 3 3    +  + 3 +x x x x x x+ − + . )A )A ( )  3 3    + 3 +x x x x = − + )A )A ( )       + 3 +x x x x= − + )A )A ( )     + x x = + = . 8$1IRSTJ5'+/ )A )A :    A  A  3x x x x− + = + + + . EF EF R  A x ≥ )A    A  A 3 )x x x x⇔ + − − + − + =    A 3 A 3 )  A  x x x x x x − + ⇔ + − + = + + − )A ( )    A 3  )  A  x x x x   ⇔ − + + =  ÷ + + −   )A  A 3 )  3x x x hay x⇔ − + = ⇔ = = )A . 4$ 8 $1 .#$% &'(⇔X X3 )A )A " *+!,-.*/  0 1  23/2 1 24)5'6.27289 9 19 :.*;6 EF. I4) 1 I4  A A  )A )A aI4  A A DBH4A.5H  0I  `) ⇒I4⇒.6CA/0 1 034) )A )A aI4)DBH4⇒.6?/04) 8 $1 #9 19 :.*!;6&'.6?/04) .6CA/0 1 034) )A. )A B.d&'9 19 :.* .d;65'#8WeW&' n ur 4.H7I.H  0I  `) ⇒.dH./00I .1 04)⇒.dH/0I10H0I4) )A )A d.c7.d4(⇔ 