一年级数学（下册）两位数与一位数全混合 21-5= 41+7= 67-2= 7+27= 52-3= 1+67= 24-7= 67+3= 26-3= 8+78= 4+67= 55+3= 47-8= 78+3= 45-3= 31-9= 58-6= 8+28= 4+75= 74-8= 68-4= 94-7= 87-3= 52+9= 33+5= 42+9= 35-2= 28+1= 31-7= 19+7= 27-2= 56-7= 67+2= 34+9= 23-5= 45+9= 37-6= 42-7= 38+1= 29+7= 76-4= 17+6= 25+3= 76-9= 43-9= 48+2= 37+9= 55-2= 42+7= 62-8=