已知1☆6=1x2x3x4x5x6,6☆5=6x7x8x9x10,按此规定,(2☆5)除以(6☆4).
问题描述:
已知1☆6=1x2x3x4x5x6,6☆5=6x7x8x9x10,按此规定,(2☆5)除以(6☆4).
答
2☆5
=2x3x4x5x6
=720
6☆4
=6x7x8x9
=3024
所以原式720÷3024=21分之5