A.求算術(shù)平均 B.求幾何平均 C.逐項遞移地求一系列算術(shù)平均 D.分段遞移地求算術(shù)平均或幾何平均
A.(1.1+1.5) B.(2.1×2.5)-1 C. D.(1.1×1.5)-1
A.14.14% B.30% C.15% D.14.89%