1)âµAOB=90
â´Oå¨ä»¥AB为ç´å¾çåä¸,å³Oå¨âGä¸
2)âµAOBCåç¹å
±å
â´COA=CBA=30
è¿Cä½CPâ¥xè½´äºP,CP=y,OP=x
â´x=â3y, y=â3x/3
Aå¨åç¹æ¶,x=3â3/2; Bå¨åç¹æ¶,x=9/2
â´y=â3x/3(3â3/2<=x<=9/2)
3)设M(3â3/2,3/2), N(9/2,3â3/2), OMNä¸ç¹å
񇧨
OM=2*M纵åæ =2*3/2=3
ON=2*N纵åæ =2*3â3/2=3â3
â´MN=ON-OM=3â3-
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