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20 0 3年全国高考数学 (江苏卷 )普遍反映试题偏难 ,新教材中新知识所占比重较大 ,选择题也有一定难度 .本文就部分选择题的解法 ,谈谈数学方法的运用 .(下列各题编号为原试题编号 ,题目见本期高考试题—编者注 )1 分析 依题意在a≠ 0的前提下 ,由判别式Δ0 ,得 4a2 -b2
The national college entrance examination mathematics (Jiangsu volume) generally reflected the difficulty of the test in 2003. The new knowledge in the new textbooks accounted for a large proportion of new knowledge, and the multiple-choice questions were also difficult. This article discusses the use of mathematical methods in the solution of partial multiple-choice questions. The following questions are numbered as the original question number, and the topic is referred to as the current high test question--Editor’s Note) 1. The analysis is based on the premise that a≠ 0, from the discriminant Δ0, to 4a2 -b2