5Denisse R,Thompson Michaele F, Chappell. Communication and Representation as Elements in Mathematical Literacy [J]. Reading and Writing Quarterly, 2007, (23): 179-196.
6National Council of Teachers of Mathematics (NCTM). Principles and Standards for School Mathematics [EB/OL]. http://en.wikipedia.org/wiki/Principles and Standards for School_Mathematics.
7Brenner. Learning by Understanding: The Role of Multiple Representations in Learning Algebra [J]. American Educational Research Journal, 1997, (34): 663-689.
8Texas Education Agency, Texas Administrative Code. Texas Essential Knowledge and Skills for Mathematics [DB/OL]. hap://ritter.tea.state.tx.us/rules/tac/chapter 11l/index.html.
