Заполните пропуски соответствующей активной или пассивной формой глагола и переведите предложения на русский язык:
1. An arithmometer (designed, was designed) by the Russian academician P. Chebyshev in 1876.
2. The second generation of electron tube computers (followed, was followed) the first generation of phototransistor computers.
3. A mechanical integrator for solving differential equations (constructed, was constructed) by the academician Y Krylov.