100以内两位数不退位减法（2023-07-19）

100以内两位数不退位减法（2023-07-19）：67-51= 64-13= 85-64= 87-84= 55-42= 77-22= 69-46= 93-41= 88-78= 44-31= 46-25= 98-24= 84-22= 89-76= 48-17= 73-32= 66-30= 58-13= 33-22= 68-24= 77-45= 41-40= 62-42= 37-27= 58-53= 77-20= 64-61= 69-43= 46-23= 91-70= 26-16= 47-42= 82-30= 93-20= 89-32= 66-10= 53-50= 59-33= 36-12= 96-54= 55-44= 76-71= 80-10=...