The basic properties of inequality (1) If a > b, then () A.ac>bc B.acb-c D.ac>b (2) If a > b, b > D, D ≥ m, then () A. A > m B. a ≥ m C. ABC, then () A.a>b B.a5 } B.{ a | a≥5 } C.{a | a＜5 } D.{a | a≤5 } (5) If A3, then () A.3 5 (8) If 2a-1 / 5 is less than a + 2 / 3, then the value range of real number a is () A.{a|a>7} B.{a|a2a B 3+a>2+a C.3+a>3-a D.3/a>2/a (10) If a > b, there must be () A.a-b>2 B.a-3b+2 D.a/-3>b/-3 (11) If real numbers a and B satisfy A-B ≤ 0, the correct one in the following inequality is () A.ab D.a≤b (12) A > b, then () A.a+3 >b+3 B.3a>3b C.-5a>-5b D.a/3>b/3 (13) The correct one in the following proposition is () A. If a > b, then AC > BC B. If a > C, then AC & # 178; > BC & # 178; C. if AC & # 178; > BC & # 178; then a > b D. if a > b, C > D, then AC > BD

The basic properties of inequality (1) If a > b, then () A.ac>bc B.acb-c D.ac>b (2) If a > b, b > D, D ≥ m, then () A. A > m B. a ≥ m C. ABC, then () A.a>b B.a5 } B.{ a | a≥5 } C.{a | a＜5 } D.{a | a≤5 } (5) If A3, then () A.3 5 (8) If 2a-1 / 5 is less than a + 2 / 3, then the value range of real number a is () A.{a|a>7} B.{a|a2a B 3+a>2+a C.3+a>3-a D.3/a>2/a (10) If a > b, there must be () A.a-b>2 B.a-3b+2 D.a/-3>b/-3 (11) If real numbers a and B satisfy A-B ≤ 0, the correct one in the following inequality is () A.ab D.a≤b (12) A > b, then () A.a+3 >b+3 B.3a>3b C.-5a>-5b D.a/3>b/3 (13) The correct one in the following proposition is () A. If a > b, then AC > BC B. If a > C, then AC & # 178; > BC & # 178; C. if AC & # 178; > BC & # 178; then a > b D. if a > b, C > D, then AC > BD

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It is mainly to grasp the nature of inequality to solve problems
1. A > b, then both sides of the inequality are added and subtracted at the same time, and the direction of inequality does not change, and the direction of inequality does not change when multiplied by a positive number that is not 0