设乙为X
128.4×3=3x+x+x+2.4
求得x=76.56
甲为76.56×3=229.68
丙为76.56+2.4=78.96
甲.乙.丙三个数的平均数是128.4,甲数是乙数的3倍,丙数比乙数多2.4,甲.乙.丙三个数各是多少?甲.
甲.乙.丙三个数的平均数是128.4,甲数是乙数的3倍,丙数比乙数多2.4,甲.乙.丙三个数各是多少?甲.
数学人气:103 ℃时间:2019-09-29 01:52:39
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