甲数的5倍是12
∴ 甲数= 12/5
乙数的3倍是5
∴ 乙数= 5/3 = 1又2/3
和: 12/5 + 5/3 = 36/15 + 25/15 = 61/15 = 4又1/15
差: 甲数- 乙数= 12/5 - 5/3 = 36/15 - 25/15 = 11/15
甲数的5倍是12
∴ 甲数= 12/5
乙数的3倍是5
∴ 乙数= 5/3 = 1又2/3
和: 12/5 + 5/3 = 36/15 + 25/15 = 61/15 = 4又1/15
差: 甲数- 乙数= 12/5 - 5/3 = 36/15 - 25/15 = 11/15