写得数:3/5乘以1/4,11/25乘以5/33,六乘以1/3乘以2/5,77/100乘以零乘以

1乘以2乘以3乘以4乘以5乘以.100积有几个零 =3乘以2乘以1,=4乘以3乘以2乘以1,=5乘以4乘以3乘以2乘以1,那么100!除以99! 一乘以二乘以三分之一加2乘以3乘以4分之一+3乘以4乘以5分之1+……+48乘以49乘以50分之1. 1乘以2+2乘以3+3乘以4+4乘以5……+97乘以98+98乘以99+99乘以100等于多少 观察1乘以2乘以3乘以4+1=25=5² 2乘以3乘以4乘以5+1=121=11² 2乘以1+4乘以3+6乘以5直接加到50乘以49 1乘以3分之2乘以4分之3乘以5分之4乘以.乘以20分之19等于多少? 一个六位数乘以1乘以2乘以3乘以4乘以5等于这六位数的倒过来的数 1乘以2乘以3分之1加上2乘以3乘以4分之1加上3乘以4乘以5分之1加上.11乘以12乘以13分之1等于多少 1乘以2乘以3分之1+2乘以3乘以4分之1+3乘以4乘以5分之1+4乘以5乘以6分之1+········+48乘以49乘 5乘以5等于0乘以1乘以100+25；15乘以15等于1乘以2乘以100+25；25乘以25 1000乘以999乘以998乘以997...3乘以2乘以乘以1的末尾连续有多少个零?