初一期中考试数学答案详解，轻松掌握解题技巧

一、选择题

题目一：下列各数中，有理数是（ ）

A. \(\sqrt{2}\)

B. \(\pi\)

C. \(\frac{3}{4}\)

D. \(-\frac{5}{2}\)

答案详解：

正确答案：C

解析：有理数是可以表示为两个整数之比的数，即形式为 \(\frac{a}{b}\)（其中 \(a\) 和 \(b\) 是整数，且 \(b \neq 0\)）。选项 A、B 分别是无理数，而选项 C 和 D 都是分数，是有理数。因此，正确答案是 C。

二、填空题

题目二：若 \(a = 2\)，则 $3a - 4 = _________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________