问题
解答题
已知⊙O的半径为2cm，点A到圆心O的距离OA=acm，且关于x的方程2x2-2
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答案
点A在⊙O的外部．
理由：因为没有实数根，所以根的判别式△=（-2
）2-4×2（a-1）＜0，2
整理得a＞2，即点A到圆心O的距离大于⊙O的半径，所以点A在⊙O的外部．
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已知⊙O的半径为2cm，点A到圆心O的距离OA=acm，且关于x的方程2x2-2
|
点A在⊙O的外部．
理由：因为没有实数根，所以根的判别式△=（-2
）2-4×2（a-1）＜0，2
整理得a＞2，即点A到圆心O的距离大于⊙O的半径，所以点A在⊙O的外部．
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| Hello! My name is Bai Ling. I'm seven years old. I go to school at eight in the morning (上午8点上学). I learn English, too. I can speak (说) English and sing English songs. I can act like a monkey or a cat, jump like a squirrel, fly like a bird, walk like an elephant. I have crayons. I can draw a teddy-bear: colour the face yellow, the nose green, the eyes blue, the mouth red, the ears purple, the hands and the feet white, the arms and the legs black. I have some milk and some bread for breakfast (早饭); have some chicken, French fries and some juice for lunch (午饭); have some hamburgers, hot dogs and some Coke for supper (晚饭). I am happy. Let's make friends (做朋友). 1. 下面是Bai Ling画的teddy bear。请你按照文中描述给它涂色。  2. 填表，Bai Ling三餐的食物名称。
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