19/12减去3/18与1/2的和,差是:
(19/12)-[(3/18)+(1/2)]
=(19/12)-(3/18)-(1/2)
=(57/36)-(6/36)-(18/36)
=33/36
=11/12。
你好!
19/12-(3/18+1/2)
=19/12-(1/6+1/2)
=19/12-(2/12+6/12)
=19/12-8/12
=11/12
19/12-(3/18+1/2)
=19/12-(3/18+9/18)
=19/12-12/18
=57/36-24/36
=33/36
=11/12