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'34%:0(*(&6;J+C%($'34*G6*
I6<%(#
)C8C93
Mn(&+*+E,F;J)(<:(+0 12
34FQ,&;<4(4]G),54;J4I4Fh
9&c+6FhB%Q:9&)=B(c0F4#
Mn(&/ &H%+LI)1+ *%<;<%o
]+)*":#
M&<(:()&%&%:7869:)
<((/ Q0`:*+,#
!(&;( *2;<1Rc&4(&)w;=
2B444Q,E,;<1I407#
4,4,YZL0123
j 54cN5 QQ)*'+(
<)L'H, &1B]4)0F4K0 1234
{
%<)LC(F4 17789&)$%H&(5
0I;<1%(R !"#
 g$%&1E0L;<1 1=%: )&;<1C(
lU44;<178v#!$%]4)4 177868

A783;=*+,_B4H7/ 1+'
34h&#
A78(0 36%<;<Q'1'(2*+/ &B%9&%Q#
A+8])&'9&%Q9&'<#
<,4,B>"LCV010W=3
<,4,- ;7%8%("CV08%02&(3|%(<*0 1234}
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/ &)w&'34*B%&'g()Q'10%:
'34_&(()0%R+F6$%*B%&)
B 07 1++H bd."3;=0 1+((+(b
)%[)&0e%Qbn(efN*+,(
e2(20 1234'34%F#
]9Zn(&NH OG75 5B 1:
)0%26*O/  H O=hfH1;8%:2L
H O4I4F1 e '344;=54;J)LI6fI
&^,"9&cH O6%=7H O6H O[G2
L6P(4)N&N+ )G*)+'
344;=#
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5}4I4F'344;=cLI)#)0
$%9L(2*+,/ &G('+IQ<[%
'[*+,9&)B)N&N&'E) N*+,+ )G$%
*[)H *+,'()#
@?
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':%#
JA-3+rr 1234|,,P;<}
  n(fN*+,)pI3;=(+1B*+I4

nT!3f‚L0<*+,e20<,P;<6)
4H'2I,P;<QGphần biến giống nhau, ,*
P;<QGphần biến khác nhau.
•)>Y L:6c,P;<&0%+(b
W4;=|@Knd#Zr}79&'B ,)& <fƒ@1ƒ
A@
@@
r r r
@ Z
> q
x y x y x y
− +
n(1 e :,P;<0<P7
Phương pháp:
MQ%B :; '(79&'B ,
MjH1;8Q
F@ &,
F>&19&'+(&,P824‚47
M82Q
r r r
@ Z
> q
x y x y x y− +

r r
@ Z Z
@
> q q
x y x y
 

r r r
@ Z
#@ # @ #@ # @ @ # @
> q
− − − + −
@>
@ Z > Z q Z
@
> q q q q q

= − + − = − + − =
T31
Z
q

09&'B ,<fƒ@u1ƒA@
a &0%6(c&*B%&I*+,9&)6*`"
3;=*+,('349&)c&F2 ()0*
%:'(&GBC( *& 6F( 326
[Q&G#=BR'34(GB(
)0F48)()>P]&3f‚([6;m
B 6;m0%6B0%C(G# L(eL0<0F*
79&%:'B ,& 'B ,G'$:6c
,P;<|+ e}6P%F7'B ,#
<,4,4,;7%8%L%$6%8#C2>"LCV013|%'34
*0 1234}
 (;<142/ 1+56)c&[%,
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M82Q
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> r Z >
@s# ?6r # @ ># ?6r # @
@s#?6>r# @ >#?6@>r# @
q ?6>r q6>r
− − −
= − −
= − − = −
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0F482%|0F4Kk@}0F4L,|0F4KkZ}B*B%,778
349&)/ &2F;J0 1234%<)L'$4+  &
)& 
MF4Kk@Z{)#
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;5 f(@(>*+R


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@ 7%<)LK >r @Z @r >>

(<:G%6^64 1"089&C%6'+8
*+&1*+/ 9&'H'<'-#
)[%I;<'3464H0(<'346-I*’"4H
7'+43;=*+,+(B/ 1+5|G04
20=}f'F'34%:I40760(#a &G
C%GB/ 1'344,<4;</ C :BG*’") 10 3
0(6QG/ C/ 1+5C(%:Q8*(&#
Về giáo viên:
F;J)'34C(c'FI(<]4)
;m0`:*+,6*+,gIgL*[)H (&^
F(); 1I40763;=*+,I 30I6*+,
c&I2c&I3;=H1)8,]LF%#
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*& 6;(G ]I5LI&%&fH1;8'#
82I%= E%F444;<1C(F786)w
;=444Q,E,;<1%:I4076G4
44L( 1=*+,6]4)'+3;=(/ 1+
N58m :)L#
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,`j/Pk
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LF+0 1234%<)L0F4G %<)L0F4KG
6;<'34G0/ &+:; '5&;<4(4]#
X(GB+0 1234<2 / &(^O(408&'343
*`4I4#(/ Q D'6(e[%I )& 
A!:; '3;=(;<'34(b;<(0
''[' :4;+*+,_('ba &G(
08&N'344I44,1 e 3;=*+,)H )[6
%'(-I*."eG()#
A+0 12346()0%'34C(c;<6)& %\;<


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