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เนื้อหาย่อ : Symbols and Sets NUMBERS AND THEIR RELATIONSHIPSㆍ1-1 Representing Num- s on a Line: Order Relations, 1 ㆍ 1-2 Comparing Nu The Sign of Equality, 5 ㆍ1-3 Comparing Numbers: The Si uality, 7ㆍ GROUPING NUMBERS IN SETS AND SUBSET Meaning of Membership in a Set, 10ㆍ1-5 Kinds of Sets, 13 . The Graph of a Set, 16 ㆍ 1-7 How Subsets Relate to S USING NUMBERS IN ONE OR MORE OPERATIONSㆍ1-8 Punc- tuation Marks in Algebra, 19 ㆍ1-9 Order of Operations, 23 ㆍ THE HUMAN EQUATION, 25ㆍCHAPTER SUMMARY, 26 ㆍ CHAPTER TEST, 27ㆍCHAPTER REVIEW, 28ㆍEXTRA FOR XPERTS, 30 ㆍ SURVEYORS AND MATHEMATICS, JUST FOR FUN, 33 ㆍ 2 Variables and Open Sentences ANALYZING ALGEBRAIC STATEMENTSㆍ2-1 Evaluating Alge- braic Expressions Containing Variables, 35.2-2 Identifying Factors, Coefficients, and Exponents, 40ㆍ2-3 Solving Open ntences, 4 ㆍPROBLEMS SOLVED WITH VARIABLES ㆍ2-4 Thi ing with Variables: From Symbols to Words, 49ㆍ2-5 Thinking with Variables: From Words to Symbols, 51ㆍ2-6 Solving Prob- lems with Open Sentences, 56 ㆍ EXTRA FOR EXPERTS, 60ㆍ THE HUMAN EQUATION, 62 ㆍ CHAPTER SUMMARY, 63ㆍCHAPTER TEST, 64ㆍCHAPTER REVIEW, 65ㆍJUST FOR FUN, 67 . 3 Axioms, Equations, and Problem Solving ENTIFYING AND USING NUMBER AXIOMSㆍ3-1 Axi Equality, 69 .3-2 The Closure Properties, 70 ㆍ3-3 Commutative d Associative Properties of Arithmetic Numbers, 73ㆍ 3