Sally is much quieter than Sam.——青夏教育精英家教网——

摘要： Sally is much quieter than Sam.

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The symbol（符号） 5！is called five factorial（阶乘）and means 5×4×3×2×1；Thus（因而）5！=120．How many 6！=？What is the result of

？Do you know 6！=

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Suppose that in Fig.2，the length of side of square ABCD is 1，E and F are mid-points of CD and AD respectively，GE and CF intersect at a point P．Then the length of line segment CP is

．（英汉词典：figure（缩写Fig．）图；length 长度；square 正方形；mid-point中点；intersect 相交；line segment 线段）查看习题详情和答案>>

10、The sum of n different positive integers is less than 50．The greatest possible value of n is（　　）

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If the linear function y=ax+b passes through the point （-2，0），but not the first Quadrant，then the solution set for ax＞b is（　　）

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Let a be the length of a diagonal of a square，b and c be the length of two diagonals of a rhombus respectively．If b：a=a：c，then the ratio of area of the square and rhombus is（　　）
（英汉词典：length长度；diagonal对角线；square正方形；rhombus菱形；respectively分别地；ratio比；area面积）

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