规定:=1*2*3*4*……*(A-1)*A 求(2!+3!/5!这么难的数学题我不会,

问题描述:

规定:=1*2*3*4*……*(A-1)*A 求(2!+3!/5!这么难的数学题我不会,

(2!+3!)!/5!
=(1*2+1*2*3)!/5!
=(2+6)!/5!
=8!/5!
=1*2*3*4*5*6*7*8/1*2*3*4*5
=6*7*8
=336

(8乘以7乘以6乘以5乘以4乘以3乘以2乘以1)/(5乘以4乘以3乘以2乘以1) 其实很简单的呀~~~ 6!=6×5×4×3×2×1 3!=3 ×2×1

(2!+3!)!/5!
=(1*2+1*2*3)!/5!
=(2+6)!/5!
=8!/5!
=1*2*3*4*5*6*7*8/1*2*3*4*5
=6*7*8
=336

8!/5!=8*7*6