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 【查看更多】
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10、The bigest number in the set{3.2,2.3,3,2.23}is ( )
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