20 以内连加连减混合运算 15+5-15= 8 - 4 + 1 1 = 11-11+12= 7 + 3 + 8 = 4 + 1 + 1 0 = 6 - 4 + 1 2 = 1 0 - 6 + 4 = 8 - 3 - 5 = 1 5 - 4 + 9 = 1 7 + 2 - 6 = 12+5-17= 1 + 1 4 - 9 = 7 + 1 + 6 = 4 + 1 6 - 4 = 3 + 9 - 3 = 8 + 6 - 8 = 8 + 8 - 8 = 1 0 - 4 + 5 = 5 + 1 - 6 = 19-10+10= 1 8 - 4 + 5 = 1 0 + 3 + 1 = 11-11+6= 1 5 - 4 + 9 = 16-9+11= 20-11+7= 14-13+2= 2 0 - 5 - 4 = 6+11-15= 3 - 2 + 1 4 = 1 8 - 9 - 8 = 4 + 1 + 1 0 = 7+11-18= 4 - 3 + 1 = 15-12+9= 18-13-1= 18+1-13= 1 3 - 6 - 4 = 1 + 7 - 8 = 4 - 2 + 1 7 = 5 + 1 0 + 2 = 1 0 + 1 + 6 = 1 5 - 9 - 2 = 1 3 + 4 + 1 = 18-18+7= 18-14+4= 3 + 5 + 1 = 1 3 + 1 - 3 = 4 + 8 - 7 = 4 + 9 - 3 = 1 2 + 4 - 4 = 2 + 8 + 1 0 = 2+13-13= 15-13+5= 18-3-13= 18+1-10= 12-11+10= 8 + 2 + 1 0 = 1 7 - 9 + 2 = 2 + 1 0 + 7 = 1 4 - 2 - 1 = 18-5-12= 8 + 1 + 6 = 11 + 2 - 5 = 9 + 7 - 1 2 = 4 + 1 0 - 6 = 6 + 1 4 - 2 = 3 + 1 2 - 7 = 1 + 8 + 8 = 9 + 1 + 3 = 20-5+5=1+ 1 5 + 1 = 6 - 2 + 1 1 = 15-11-3= 15-1-14= 3 + 8 + 4 = 7+11-15= 16-13+2= 2 + 3 - 2 = 1 3 + 7 - 4 = 1 0 - 9 + 8 = 1 9 - 3 - 6 = 1 0 + 6 - 5 = 3 + 1 4 - 6 = 7 - 7 + 1 6 = 1 2 - 4 + 2 = 1 0 + 2 - 2 = 15+5-15= 8 - 4 + 1 1 = 11-11+12= 7 + 3 + 8 = 4 + 1 + 1 0 = 6 - 4 + 1 2 = 1 0 - 6 + 4 = 8 - 3 - 5 = 8 - 3 + 1 3 = 1 7 + 2 - 6 = 12+5-17= 1 + 1 4 - 9 = 7 + 1 + 6 = 4 + 1 6 - 4 = 3 + 9 - 3 = 8 + 6 ...