=15+192+693+1680+3315+5760+9177+13738+19575+26880 =81025
=15+192+693+1680+3315+5760+9177+13738+19575+26880 =81025
(2x4x6x8x10+1x3x5x7x9)/(1x2x3x4x5)解,得:==[2(1*2*3*4*5)+1*3*5*7*9)]/(1*2*3*4*5)==[2(1*2*3*4*5)/(1*2*3*4*5)]+[(1*3*5*7*9)/(1*2*3*4*5)]==2+(63/8)==9.875 (10x9x8x7x6-5x4x3x2x1) / ( 3x4x5x6x)解,得:=... 分析总结。 扫码...