A:CH3COOH
B:HOOC—COOH
C:CH3CH2CHO
D:
已知△ABC内一点O满足 OA→+2OB→+3OC→ = 0→ ,若△ABC内任意投一个点,则该点△OAC内的概率为( )
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分式方程2x-1﹣3x+1=0的解为( )