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# answer84 - 8401 x y i x i y(90 6 8 735 x y xy xy x y x y xy...

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\ * D i ` \ ( 29 x , y x y + x y - xy x y 735 (90, 6) ( ) ( ) 735 x x y x y xy y + + - + + = 2 735 x x xy y + + = 2 (2 1) 735 x y y y + + = 2 2 ( 1) 15 7 x y y + = × 15 6, 90 ( , ) (90, 6) 1 7 x y y x x y y = = = = + = β /ℑ♠ ,= = + = + 29 ℑ♠ ( ( = + = + = + = + π ℑ♠ ABC a , b , cy a < b < cy 6 1 = + - + b c a a c b y y ay by c = __________ 3 4 5 8401 8402

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[ 1] 2 2 2 2 2 2 , a b c b a c = - = - a b c b a c b c b c a a c a c b b c a a c b - - - = - - - - - = + - + = 2 2 2 2 ) ( ) ( 6 1 ab c b a b a ab b a b a c ) )( ( ) ( ) ( 2 2 - + - - = - - - = 2 ) )( ( 2 ) ( 2 ) ( ) ( 2 2 2 2 2 c b a c b a c b a b a b a ab - + + + = - + = + - + = c b a b a + + - - = ) ( 2 6 1 13 ay 11 b = c (*) ° l 169 a 2 286 ab + 121 b 2 = c 2 = a 2 + b 2 (4 ay 3 b ) (21 ay 20 b ) = 0 4 3 = b a y 21 20 = b a y y a < b < cy 3 2 + 4 2 = 5 2 20 2 + 21 2 = 29 2 ay by c = 3 4 5 20 21 29 ay by c = 20 21 29 (*) ay by c = 3 4 5 [ 2] (1) a = m 2 n 2 b = 2 mny c = m 2 + n 2 m > n y 6 1 = + - + b c a a c b y = + - - 6 1 ) ( 2 2 2 2 2 2 n m n m m mn 6 1 = + - - n m n m m n 7 m 2 11 mny 6 n 2 =0 ( my 2 n ) (7 m +3 n ) = 0 m =2 ny 7 m = 3 n ( ) m =2 ny ay by c = 3 4 5 (2) a = 2 mny b = m 2 n 2 c = m 2 + n 2 m > n y 6 1 = + - + b c a a c b y = - + - 6 1 2 2 ) ( 2 2 2 2 m mn n m n m 6 1 - = + - - n m n m m n 5 m 2 13 mny 6 n 2 =0 (5 m +2 n ) ( my 3 n ) = 0 m =3
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answer84 - 8401 x y i x i y(90 6 8 735 x y xy xy x y x y xy...

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