2×4×6×.×2n为啥等于2的n次方乘n的阶乘?

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2×4×6×.×2n为啥等于2的n次方乘n的阶乘?2×4×6×.×2n为啥等于2的n次方乘n的阶乘?2×4×6×.×2n为啥等于2的n次方乘n的阶乘?2×4×6×.×2n=2×2×2×……×n×(1×

2×4×6×.×2n为啥等于2的n次方乘n的阶乘?
2×4×6×.×2n为啥等于2的n次方乘n的阶乘?

2×4×6×.×2n为啥等于2的n次方乘n的阶乘?
2×4×6×.×2n=
2×2×2×……×n×(1×2×3×.×n)
n个2 相乘,括号中是n的阶乘.