* 加法的初步认识 ( ) ( ) ( ) ( ) 3 1 2 2 4 1 3 2 2 1 4 4 5 5 3 ( ) 1+2= 3 + = 3 1 4 + = + = 2 2 4 5 1 4 + = + = 1 3 4 *
加法的初步认识.ppt
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* 加法的初步认识 ( ) ( ) ( ) ( ) 3 1 2 2 4 1 3 2 2 1 4 4 5 5 3 ( ) 1+2= 3 + = 3 1 4 + = + = 2 2 4 5 1 4 + = + = 1 3 4 *
加法的初步认识.ppt