题目内容
90连续减9,写出每次减得的差.
90:81 ________ ________ ________ ________ ________
填一填
80连续减8,写出每次减得的差.
80 72 ____ ____ ____ ____ ____ ____ ____
60连续减5,写出每次减得的差.
60:55 ________ ________ ________ ________ ________
80