The symbol(符号) is called four factorial(阶乘)and means 4×3×2×1; thus(则) =24.the true one of the following statements is _____.(A)5!+4!=9!(B)5!-4!=1(C)5!.=20!(D)5!+4!=5

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The symbol(符号) is called four factorial(阶乘)and means 4×3×2×1; thus(则) =24.the true one of the following statements is _____.(A)5!+4!=9!(B)5!-4!=1(C)5!.=20!(D)5!+4!=5
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The symbol(符号) is called four factorial(阶乘)and means 4×3×2×1; thus(则) =24.the true one of the following statements is _____.(A)5!+4!=9!(B)5!-4!=1(C)5!.=20!(D)5!+4!=5
The symbol(符号) is called four factorial(阶乘)and means 4×3×2×1; thus(则) =24.the true one of the following statements is _____.
(A)5!+4!=9!(B)5!-4!=1
(C)5!.=20!(D)5!+4!=5

The symbol(符号) is called four factorial(阶乘)and means 4×3×2×1; thus(则) =24.the true one of the following statements is _____.(A)5!+4!=9!(B)5!-4!=1(C)5!.=20!(D)5!+4!=5
没对的

对啊,没答案