甲是4,乙是3,甲比乙多几分之几,乙比甲少几分之几,甲乙之和是甲的几倍,乙是甲乙之差的几倍? 解,得: (1)(4-3)/3==1/3 (2) (4-3)/4==1/4 (3) (4+3)/4==7/4 (4) 3/(4-3)==3/1==3