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看数射线做加减法,0 1 2 3 4 5 6 7 8 9 10,2,7,+,2,9,看图列式,0 1 2 3 4 5 6 7 8 9 10,-,7,2,2,5,0 1 2()4 5 6 7 8()10,9,-,5,4,3,+,6,9,6,-,3,5,9,1,2,3,4,5,0,6,7,8,9,10,0+5=5,(,),判断:对的打,错的打,1,2,3,4,5,0,6,7,8,9,10,2+7=9,(,),判断:,1,2,3,4,5,0,6,7,8,9,10,2+4=7,(,),2+5=7,选择:,(1)2+4=6(2)5-3=2(3)2+3=5,(),3,选择:,(1)1+5=6(2)6-5=1(3)6-1=5,(),2,0 1 2 3 4 5 6 7 8 9 10,根据算式在数射线上画一画,并算出结果:,14,5,