这个我还真查了一下

With multiplication you have a multiplicand (written second) multiplied by a multiplier (written first). The unit for the multiplier has to be sets of the unit for the multiplicand. For example, if you have 3 bags each containing 5 apples, then you can multiply to give

[3 BAGS] x [5 APPLES PER BAG] = 15 APPLES

Note how the units cancel: BAGS X APPLES/BAG = APPLES

所有跟帖： 

• 数学教材写成这样，俺醉了。 -skyport- ♂ (0 bytes) () 04/06/2016 postreply 11:46:43

• 原来被乘数写在后面，乘数写在前面。 -Francine- ♀ (0 bytes) () 04/06/2016 postreply 11:47:33

• 我就觉得有些神经质，不过怎么找办法counter? -usagi- ♀ (0 bytes) () 04/06/2016 postreply 11:59:55

• 我们在中国学数学的时候是被乘数在前，乘数在后，和这正好相反。还有乘法交换律，前后就没关系了。 -sfbayparent- ♂ (0 bytes) () 04/06/2016 postreply 15:40:58