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125x14x4x8x25x5x20这道题怎样简便计算?求答案急急

原式=(125x8)x(4x25)x(5x20)x14 =1000x100x100x14 =10000000x14 =140000000

这有什么意义吗?再说你这不专业了,题目应该是30!=?

http://baike.baidu.com/view/245476.htm 百度直接搜索“251就有结果了 1.5511210043331 * 10 ^25

78x4x25x20 =78x100x20 =7800x20 =156000

50x25x4x20用简便计算怎么计算? 50x25x4x20 =50*20*25*4 =1000*100 =100000

1. 14x99+14 =14×(99+1) =140 2. 25x32 =25×4×8 =100×8 =800 3. 40x25x35x20 =40×25×700 =1000×700 =700000

=135×20×(25×4) =2700×100 =270 000

方法如下: 19x25x4x20 =(19x20)×(25x4) =380x100 =38000

表示H型钢: 截面高H:700mm, 截面宽B:300mm, 腹板厚度t1:25mm, 翼板厚度t2:20mm.

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