66x21十19x21十85x19=?求简算!

66x21十19x21十85x19=?求简算! 66X21+19X21+85X19怎么简便计算? 66X21+19X21+85X19的简便方法计算 用简便方法计算下面各题(脱式计算）:(1)66x21+19x21+85x19 (2)36x111+888x8 (3)99 简便计算,66X21+19X21+85X19===这样发来,是人教版数学小状元四年级下册的23页的第7题的第一小题,最好 1/1X3+1/3X5+1/5X7...1/17X19+1/19X21= Lingo程序中,a=@if(x11-x21#ge#0,0,x21-x11)是什么意思? 13除以19十18x19分之13简算 (2X2)/1X3+(4X4)/(3X5)+(6X6)/(5X7)+...+(20X20)/(19X21)==? 2/1X3+2/3X5+2/5x7+.+2/19x21 12x231=132x21,13x341=143x31.=_= matlab循环计算x11=0.3 x21=0.4x12=0.254273-0.155503x11+0.560625x2