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jie you li shu wen ti chang fan cuo wu bian xi
Author(s): 
Pages: 24-26
Year: Issue:  10
Journal: Required Reading for Junior Middle School Students

Keyword:  有理数 辨析 原式 相反数 正确答案 正确解答 错解 乘方运算 顺序错误 运算性质;
Abstract: <正>在解题中出现错误是难免的,也是正常的.但必须弄清产生错误的原因,掌握正确的解答方法,只有这样才能逐步形成数学基本技能和能力.本文就有理数中解题易犯的错误归纳剖析如下.一、符号错误从某种意义上说,有理数运算的难点在符号.例1计算:(-7)×(-5)-90÷(-15).错解原式=35-(+6)=29.辨析此题错在把90前面的"-"既当作运算符号,又当作性质符号.应该明确,对于符号"-"在运算中只能当作二者的一种.
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