Slide 1

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- ABCACABBC4

AC=AB+BC ABC AC=AB+BC B=1

ABCDEFE=1 , AB=DE, BC=EF

DEF E=1 , , DF=DE+EF DF=AB+BC [ ] DF=AC DF=AC ABCDEF

ABCDEFABC DEF ,AB=DE, BC=EF, AC=DF,, ABC DEF B= E E= B=

XYZ PMN ?+=? ABC A= BE CF ,4 (BE+CF) = 5BC