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The magnetic properties of the mixed ferro-ferrimagnetic compounds with (AxB1-x)yC, where A, B, and C are three different magnetic ions and form three different sublattices, are studied by using the standard mean-field theory. The phase diagram which is related to experimental work of molecule-based ferro-ferrimagnet (NiⅡxMn1Ⅱ-x)1.5[CrⅢ(CN)6]· zH2O is obtained. The magnetization curves, internal energy, and specific heat of the same mixed (Ax B1- x) y C system are also investigated.