四张机是什么意思:A houseful,a roomful,can't catch a spoonful.

A houseful,a roomful,can't catch a spoonful. (a×a)(a×a)=???????? |a|+a=0,a? da 篮球 a a a 非常急`a a a |a|+|b-a|-|c-a|-|a+b| 1×A = A intel A* A* a属于{a}吗? 蓝屏a a