4.What comes once in a year,twice in a week and never in a day?

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• 4.What comes once in a year,twice in a week and never in a day?
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• what comes once in a year,twice in a week,never in a day?
• what comes once in a year,twice in a week,never in a day?
• What occurs twice in a leftime,but once in a year,twice in a week but never in a day?
• What comes once a year,twice a week and never a day?
• 4.What comes once in a year,twice in a week and never in a day?
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• 抛物线y=-1/2x^2+1/2x+6与x轴交于AB 两点,与y轴交于C点已知点E（0,-3）,在第一象限的抛物线上取点D,连接DE,使DE被x轴平分,试判断四边形ACDE的形状,并证明你的结论我已经算出这里A（-3,0）,B（4,0）要解题思路和详细的过程谢谢了