[en] We report the results of the calculations of the weak decays D⁺→K(π)lv_l, D^O→K(π)lv_l and D⁺, D^O → two pseudoscalars, where use is made of the transition vector form factors D→K, D→π, obtained without free parameters in anisotropic chromodynamics (ACD). Good agreement with experiments is obtained for D⁺ decays, while for D^O → two pseudoscalars the W-exchange diagram, which is outside the present framework, plays an important role. We show that a simple parametrisation of these contributions works out very well, and leads to the correct determination of Γ(D^O→anti K^OK^O). (orig.)