Переведите предложения подчеркните инфинитив и объясните его синтаксическую функцию a) A very

Переведите предложения подчеркните инфинитив и объясните его синтаксическую функцию a) A very interesting problem is to produce a practically limitless source of energy. b) The CPU of a computer to be arranged in a single or very small number of integrated circuits is called a microprocessor. c) Computers to have been designed originally for arithmetic purpose are applicable for great variety of tasks at present. d) The memory stores the instructions and the data to be quickly retrieved on demand by the CPU.