The symbols “4! is called four factorial and means 4×3×2×1; thus 4!=24. The true one of the follow——青夏教育精英家教网——

摘要： The symbols “4! is called four factorial and means 4×3×2×1; thus 4!=24. The true one of the following statements is A. 5!+4!=9! B. 5!-4!=1 C. 5!-4!=9! D. 5!÷4!=5

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10、The bigest number in the set{3.2，2.3，3，2.23}is （　　）

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3、If the n-th prime number is 47，then n is

．（英汉词典：the n-th prime number 第n个质数）

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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>>

5、Digits of the product of 25¹⁷×2³³is（　　）
（英汉小词典：digits位数，product乘积）

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If a and b are non-zero real numbers and （1-99a）（1+99b）=1，then the value for

+1 is（　　）

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