如对自然数n作竖式加法n+(n+1)+(n+2)均不产生进位现象,则称n为“不...答:(1)1,2 (2)32 (3)100以内1,2,10,11,12,20,21,22,30,31,32,100一共12个;200以内101,102,110,111,112,120,121,122,130,131,132,200一共12个;300以内201,202,210,211,212,220,221,222,230,231,232,300一共12个;400以内301,302,310,311,312,320,321,322,330,331,332...