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1
1
06
3
4 5
32+42=52
9+16=25
...
. ( )
C D
E
B
A
a b c
a
b
c
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() BC D ,ABC
90C222 CBACAB
ABC90C
2222 BCADCDAB
CB
A
a
bc
() ? () ?
() a=3,b=4 , c=?
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