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0的加减法,7+0=7,0+7=7,4-4=0,试一试,0+7= 5+0= 7-0= 5-5= 0+4= 3+0= 4-0= 6-6= 0+5= 6+0= 3-0= 7-7= 0+8= 9+0= 8-0= 4-4=,7,4,5,8,5,3,6,9,7,4,3,8,0,0,0,0,仔细观察，你发现了什么？,4 1 = 3,练一练 1.,4 2 = 2,4 3 = 1,4 4 = 0,2.对号入座,二、比一比，看谁算得快又对。,3 + 1 = 4 2 + 3 = 5 4 + 1 = 5 1 + 0 = 1 5 2 = 3 4 4 = 0 0 + 5 = 5 1 0 = 1 2 + 0 = 2 3 + 0 = 3 4 2 = 2 0 + 0 = 0 5 4 = 1 5 3 = 2 4 0 = 4 0 0 = 0 5 1 = 4 3 2 = 1,3 + 1 = 2 + 3 = 4 + 1 = 1 + 0 = 5 2 = 4 4 = 0 + 5 = 1 0 = 2 + 0 = 3 + 0 = 4 2 = 0 + 0 = 5 4 = 5 3 = 4 0 = 0 0 = 5 1 = 3 2 =,3.比一比，看谁算得又对又快,5,5,1,3,0,5,1,3,2,0,1,2,4,0,4,1,2,4,数学游戏,5-0=5,1+3=4,
