(1/10×1/9×1/8×…×1/2×1)^10 ×(10×9×8×7×…×3×2×1)^10

问题描述:

(1/10×1/9×1/8×…×1/2×1)^10 ×(10×9×8×7×…×3×2×1)^10

=(1/10*10*1/9*9*……1*1)^10
=(1*1*1...)^10
=1^10
=1