两位数减一位数退位减法练习题0

28-9 =16-8 =21-4 =18-9 =35-6 =31-4 =16-7 =33-5 =32-5 =42-5 =57-9 =61-4 =73-5 =74-6 =54-7 =23-4 =36-8