单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,数学闯关,第一关,分解组成,10,2,8,15,4,（）,7,5,2,18,2,（）,8,3,5,20,5,（）,9,5,4,11,4,（）,11,16,15,7,12,5,7,14,1,（）,7,3,4,17,4,（）,8,6,2,8,2,（）,9,2,7,9,7,（）,13,13,6,2,第二关,口算小火车,15+9=,17+3=,10+10=,16+9 =,14+9 =,24,20,20,25,25,1,25-3=,30-20=,35-4=,90-20=,32-2=,22,10,31,70,30,2,12+4=,19+5=,13+7=,20+4=,12+2=,16,26,20,24,14,3,16 +1 =,12 +2 =,15+5 =,17+9 =,14+4=,17,14,20,26,18,4,13 +1 =,2 +14 =,1 +5 =,6 +2 =,7 +1 =,14,16,6,8,8,5,2 +2 =,4 +1 =,3 +2 =,2 +6 =,7 +1 =,4,5,5,8,8,6,5 +1 =,3 +3 =,4 +2 =,3 +1 =,2 +3 =,6,6,6,4,5,7,3 +2 =,4 +1 =,1 +3 =,2 +4 =,6 +2 =,5,5,4,6,8,第三关,找出朋友,4,3+5,4+2,1+4,2+5,5+2,5+3,2+4,4+1,3,2,1,4,3+5,4+2,1+4,2+5,5+2,5+3,2+4,4+1,3,2,1,4,3+5,4+2,1+4,2+5,5+2,5+3,2+4,4+1,3,2,1,4,3+5,4+2,1+4,2+5,5+2,5+3,2+4,4+1,3,2,1,4,3+5,4+2,1+4,2+5,5+2,5+3,2+4,4+1,3,2,1,4,3+5,4+2,1+4,2+5,5+2,5+3,2+4,4+1,3,2,1,互 换 法,6+4=,4+5=,3+5=,6+5=,5+7=,5+6=,4+6=,7+5=,互 换 法,5+4=,5+3=,9,8,10,11,12,8,9,11,12,10,第四关,看谁算得快,8,1 +5 =,3 +3 =,4 +2 =,2 +3 =,3 +1 =,6,6,6,5,4,9,3 +3 =,2 +3 =,5 +1 =,6 +2 =,1 +4 =,6,5,6,8,5,10,2 +6 =,3 +2 =,1 +5 =,4 +2 =,3 +4 =,8,5,6,6,7,。