1*6=1x2x3x4x5x6 5*6=6x7x8x9x10 求(2*5)/(6*6)

问题描述:

1*6=1x2x3x4x5x6 5*6=6x7x8x9x10 求(2*5)/(6*6)

(2*5)/(6*6)=(2x3x4x5x6)/(6x7x8x9x10x11)=1/462