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A B B x y x A y M ( x;y ) ( S ) 1 cm ( S ) x y 8><>: ( S ) x +5 y • 50 x y x +3 y • 342 x + y • 152 y x 16 20 150 g 680 g 500 10 g 60 g 50 10 g 40 g 20 1

1

10 g

40 g

20

10 g

60 g

50

150 g

680 g

500

16

20

x

y

x

y

(S)

( S )

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 

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x

y

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M (x, y)

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y

x

A

y

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A

B

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

− 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

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