甲乙丙丁四个数,甲乙之和68.8,乙丙之和39.7,丙甲之和71.5,乙丁之和40,求着四个数分别是多少?
甲乙丙丁四个数,甲乙之和68.8,乙丙之和39.7,丙甲之和71.5,乙丁之和40,求着四个数分别是多少?
日期:2010-07-06 14:37:13 人气:3
乙:(68.8+39.7-71.5)÷2 = 18.5
甲:68.8-18.5 = 50.3
丙:71.5-50.3 = 21.2
丁:40-18.5 = 21.5
甲乙丙丁四个数,甲乙之和68.8,乙丙之和39.7,丙甲之和71.5,乙丁之和40,求着四个数分别是多少?