대하다 = to treat someone ex) 차갑게 대하다. = be cold to someone
It is more like reaction. ex) the way that 20s and 60s treat(?) new technology. 20대와 60대가 신기술을 대하는 방법. It does not say, how they use new technology. it says "What they feel for new technology".
다루다. is more like control, handle ex) Treat the computer carefully, it's expensive. 컴퓨터를 조심해서 다뤄. 비싼 거야. ex) Treat the case(affair) carefully. they are our company's VIP. 그 사건을 조심해서 다뤄. 그분들은 우리 회사 VIP셔.
처리하다 means process. not control. ex) Treat the case carefully. they are our company's VIP. 그 사건을 조심해서 처리해. 그분들은 우리 회사 VIP셔.
ex) Treat the computer carefully. It's expensive. 컴퓨터를 조심해서 처리해(X) ex) How to use hammer. = 망치를 다루는 방법. 망치를 처리하는 방법 (X)
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