238U, 235U and 233U were irradiated with 85, 90 and 100 MeV 12C ions to measure the fission-product nuclei radiochemically and elucidate the feature of the heavy-ion-induced fission of actinides in comparison with that of the light-ion-induced fission. Charge dispersion curves constructed with the observed isobaric triplets were concluded to have an equal width σ = 1.05 ± 0.10 irrespective of the target nuclides and incident energies within the error, which turned out to coincide with that of the energetic proton fission of 238U. The deduced charge distribution was then analyzed to suggest the fissioning nucleus that once reached the saddle follows essentially the identical fate as light-ion fission even if the behavior during the course from equilibrium deformation to the saddle might be different from each other. The width of the obtained mass-yield distribution was found to decrease as energy increases. This, with other observations, strongly suggests that the broad single-gaussian distribution generally accepted for heavy-ion fission should be replaced by a double-gaussian distribution: the separation of the centroids reduces as energy increases.