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Problem
Problem
In a
△
A
B
C
\triangle ABC
△
A
B
C
, if
r
1
=
2
r
2
=
3
r
3
r_1 = 2r_2 = 3r_3
r
1
=
2
r
2
=
3
r
3
, then show that
a
b
=
5
4
\frac{a}{b} = \frac{5}{4}
b
a
=
4
5
.
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