I have a cold today. you?——青夏教育精英家教网——

摘要： I have a cold today. you?

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As in right figure，in a quadrilateral ABCD，we have its diagonal AC bisects∠DAB，and AB=21，AD=9，BC=DC=10，then the distance from point C to line AB is

，and the length of AC is

．（英汉词典：quadrilateral 四边形；bisect 平分）查看习题详情和答案>>

We have the following numbers

，the maximum number among them is

，the minimum number is

．（英汉小字典：number数maximum最大的minimum最小的）查看习题详情和答案>>

20、Assume that a，b，c，d are integers，and four equations （a-2b）x=1，（b-3c）y=1，（c-4d）z=1，w+100=d have always solutions x，y，z，w of positive numbers respectively，then the minimum of a is

．
（英汉词典：to assume假设；integer整数；equation方程；solutions （方程的）解；positive正的；respectively分别地；minimum最小值）!

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7、If ax^my^pand bxⁿy^qare similar terms，then we must have （　　）（英汉小字典：similar terms：同类项）

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“May you have a good summer holiday．”（祝你有个快乐的暑假），在这段句子的所有英文字母中，字母a出现的频率是

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