I have no idea what you mean in the first case, as for the other two I'm pretty sure they can both be solved by an integrating factor.
#3
PrivatePYLE
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ahh i c...but i always find difficulty on the D.E( differential equation) because i don't have enough ree. / books.. actually a I am a poor students w/c don't have enough knowledge about thid topic. BSED-math is my course but unfortunately my subject in D.E is modular( self study). we don't have a class session, they only given us an assignment. that's why i always encountered some difficulty in this topic.