7分之21-4分之1-0.75脱式计算怎么算啊,_数学解答

7分之21-4分之1-0.75脱式计算怎么算啊,

人气：324 ℃　时间：2020-04-30 22:29:14

解答

21/7-1/4-0.75
=21/7-1/4-3/4
=21/7-(1/4+3/4)
=21/7-1
=21/7-7/7
=(21-7)/7
=14/7
=2