I have a solution for the last one, and I think I know how to solve the second one, though it's not really my style, so I made my own variation:
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi2hhZbZIXTFUq7XjiRbPoNrQ6b9Iho1i8wJ4qUvQFvnrdrr5K95bPUSZJRFHFpzSbYPSQTReHFuR6pBGWgx-44Qs6nun6p9J7qGzK2oqbFeZddAuNir0Q1qWEB_wYw0tvNs23OBPY6l9zx/s400/Banangrams+puzzle-435x277.jpg)
If you want a rather significant hint to how to approach these puzzles, I suggest looking at this post and this one.
Enjoy!