一亩地,种树苗.2·5米乘以2·5米;另外3米乘以3米分别可以栽好多棵树?
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.
一亩地能种多少棵树 规格是3米乘以2.5米的
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
=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!
1乘以2乘以3乘以4乘以5乘以.100积有几个零
5亩地可以种几棵树?我有5亩地,要种树,每棵树间距是3米乘3米的,可以种几棵树呢?
2乘以1+4乘以3+6乘以5直接加到50乘以49
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
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?
0.23乘以5分之3乘以负一的3次方减去19乘以负一的4次方减0.23乘以5分之2的简便方法
一分地等于几米乘以几米?一亩地呢?
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