Определить функцию инфинитива в предложениях

1.In order to make interplanetary flights in the future it is necessary to know factors affecting the human organism.

2. The main purpose of the computers is to solve complex problems quickly.

3. The Russian science was the first to make great contribution to the development of space technology.

1. In order to make interplanetary flights in the future it is necessary to know factors affecting the human organism.

In order to make - выполняет функцию обстоятельство цели, т.к. инфинитиву предшествует союз in order.

it is necessary to know - выполняет функцию подлежащего т.к. инфинитив стоит после безличного оборота it is necessary.

2. The main purpose of the computers is to solve complex problems quickly.

is to solve - выполняет функцию составного именного сказуемого.

3. The Russian science was the first to make great contribution to the development of space technology.

was the first to make - выполняет функцию определения.