一又五分之四减七分之三见七分之四简便算
问题描述:
一又五分之四减七分之三见七分之四简便算
答
1(4/5)-(3/7)-(4/7)
=(9/5)-[(3/7)+(4/7)
=(9/5)-1
=(9-5)/5
=4/5