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4,3,6,3,5,3,7,3,7 + ( ) = 10,7 + 3 + 1 = ,1,3,2,4,3,11,7 加 几,1,7 + 5 = ,3,10,2,12,2,想一想,7 + 4 = ,3,10,7 + 6 = ,10,1,11,3,3,13,7 + 7 = ,10,3,4,14,3,7 + 8 = ,7 + 8 = ,10,3,5,15,方法一,方法二,想 8 + 7 = 15,所以 7 + 8 = 15,7 + 9 = ,7 + 9 = ,10,3,6,16,想 9 + 7 = 16,所以 7 + 9 = 16,做一做,7 + 4 = 7 + 5 = 7 + 6 =,7 + 7 = 7 + 8 = 7 + 9 =,11,12,13,14,15,16,