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一、有关概念理解错误例1给出下列四个命题:(1)若|a|=0,则a=0;(2)若|a|=|b|,则a=b或a=-b;(3)若a∥b,则|a|=|b|;(4)若a∥b,b∥c,则a∥c.其中正确的命题有A.0个B.1个C.2个D.3个错解D错因分析(1)忽略了0与0的区别.(2)混淆了
1. The following four propositions are given in relation to the misunderstanding of concepts: (1) a = 0 if | a | = 0; (2) a = b or a = (4) If a∥b, b∥c, then a∥c. Wherein the correct proposition has A.0 B.1 C .2 D.3 misplaced D error analysis (1) ignores the difference between 0 and 0. (2) confused