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: 20 32 18 max
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2 5 4 min
1 2 3 4
6 2 9 32
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32 30 36 max
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y 2(7)
1
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4(9)

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( )
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20 20 24 min
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52 60 36 min
1 2 3
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1
2 4 3 6(2)

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3
tuy y, 1, 2,3
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22
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5
3
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11
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6 3
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310
3
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x
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f y
%

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( )
8 9 min
1 2 3
3 2
1 2 3
2
1 2 3
3 18
1 2 3
2 3 16
1 2 3
6
12
15
f x x x x
x x x
x x x
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f,
( )
( )
*
*
min max
7 3
11
; ; ;0
10 2 10
9 9 57
; ;
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711
10
y
x
f f
=

=
= =
%

×