问题 解答题

端午节吃粽子是中 * * 的传统习俗.又快到农历五月初五端午节了,小明奶奶包了6个粽子,其中有3个是枣豆馅的,有2个是鲜肉馅的,有1个是咸蛋黄馅的(这些粽子除馅料不同外其他外观均相同.小明随手拿了两只来吃.

(1)求小明第一个就吃到了喜欢的鲜肉馅粽子的概率.

(2)求小明所吃两只粽子馅料相同的概率.

(3)若在吃粽子之前,小明准备用一枚均匀的正六面体骰子进行吃粽子的模拟试验,规定:掷得点数1,2,3向上代表吃枣豆馅的,点数4,5向上代表吃鲜肉馅的,点数6向上代表吃咸蛋黄馅的,连续抛掷这个骰子两次表示随机吃两只粽子,从而估计吃两只粽子刚好都是枣豆馅的概率.你认为这样模拟正确吗?试说明理由.

答案

(1)小明第一个就吃到了喜欢的鲜肉馅粽子的概率是

2
6
=
1
3
.(4分)

(2)设枣豆馅的、鲜肉馅的、咸蛋黄馅的分别为A、B、C,列表得:

(A,C) (A,C) (A,C) (B,C) (B,C) -
(A,B) (A,B) (A,B) (B,B) -(C,B) 
(A,B) (A,B)  (A,B)  -(B,B) (C,B) 
(A,A)  (A,A)-(B,A) (B,A)  (C,A) 
(A,A) -(A,A) (B,A)  (B,A)  (C,A) 
-(A,A) (A,A) (B,A)  (B,A)  (C,A) 
∴一共有30种情况,小明所吃两只粽子馅料相同的有8种情况,

∴小明所吃两只粽子馅料相同的概率是

8
30
=
4
15
.(8分)

(3)不正确.概率问题需要做多次试验,才可近似求得.

完形填空

Critical thinking means thinking logically and developing an ability to ask questions or ask for evidence for a particular subject. Developing critical thinking skills in a child through the right critical thinking exercises is very important.

Critical thinking develops the ability of subjective analysis of a particular fact. Critical thinking is to evaluate the reason behind a particular fact. All possible viewpoints must be thought about before analyzing a fact, and this develops problem-solving skills in a child.

Here are some exercises you can use to encourage your child to think critically.

Quiz your child. Ask your child about daily activities that he does in the school. Quiz him about certain things that do not have a single correct answer. This will increase his ability to think about the things he’s just learned in class. Keep on telling your child simple information about nature, like the seasons when flowers bloom. You can either ask him questions or just explain to him in a casual way.

Recognize and classify. For critical thinking, your child must learn to recognize important information that is closely connected with the subject. Classification of things on a certain firm and logical basis of information is included in the critical thinking ability. Colorful toys or images can be included in teaching critical thinking. Ask your child to identify the names of the flowers, fruits and animals from a colorful chart.

Critical thinking exercises are not intended to make your child intelligent, but it is about making him successful in his decision-making ability and helping him make a successful career. Although thinking habits are cultivated(培养) in early childhood through exercises, they are indeed helpful for a lifetime.

Title: Critical Thinking Exercises for Children

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