100以内两位数加减一位数(进位退位) 口算练习题 18+6= 27+7= 28+2= 36+6= 27+8= 23-9= 94-5= 77-8= 60-4= 80-5= 48+5= 49+6= 18+8= 48+7= 18+7= 50-6= 60-7= 90-8= 50-9= 91-2= 7+56= 9+35= 4+36= 8+49= 6+68= 42-7= 32-8= 73-8= 83-9= 34-5= 24+6= 15+7= 55+8= 67+5= 48+6= 93-9= 44-5= 84-6= 46-7= 85-9= 87+3= 76+4= 77+9= 68+9= 69+1= 25-6= 15-7= 65-8= 75-9= 56-7= 58+2= 68+3= 39+4= 47+5= 75+6= 72-7= 42-8= 80-3= 91-5= 94-7= 44+7= 32+8= 12+9= 28+4= 86+5= 84-8= 64-9= 35-6= 95-7= 75-8= 34+6= 43+7= 53+8= 35+7= 89+2= 41-6= 61-7= 22-9= 91-8= 83-4= 76+5= 57+4= 19+5= 37+6= 45+7= 61-8= 24-6= 54-7= 84-8= 34-9= 69+5= 73+7= 28+7= 81+9= 13+8= 96-8= 66-9= 57-8= 87-9= 48-9= 72-2= 45-9= 86-8= 96-2= 24-9= 40-2= 46-9= 43-4= 18-2= 38-8= 35+5= 85+2= 59-4= 78+10= 82-5= 64+6= 32+7= 49-5= 63+3= 84-2= 60-4= 11+20= 45-3= 30+8= 60-7= 25+4= 36-5= 84+4= 52-3