add solution to Exercise 10.4-1.

Included are the following 2 files:

	10.4-1.pdf
	10.4-1.tm

Thank you!
							Lawrence X. Amlord
							   Jun 4th, 2014
							   Xi'an, China
add solution to Exercise 10.3-5.

Included are the following 2 files:

	10.3-5.pdf
	10.3-5.tm

Thank you!
							Lawrence X. Amlord
							  Jun 5th, 2014
							  Xi'an, China
fix typo in solution to Exercise 2.1-3.

Modified are the following 2 files:

	2.1-3.pdf
	2.1-3.tm

Thank you!
							Lawrence X. Amlord
							  Jun 5th, 2014
							  Xi'an, China