UEC Junior 2 · 数学 (Mathematics)
二元一次方程组 (Simultaneous Linear Equations)
代入消元法与加减消元法是初二统考的必考核心，掌握这些技巧才能确保在计算繁琐系数时不会发生变号失误。面对这类题型时务必多加练习文字题列式，因为很多同学往往在将题目转化为方程式的过程中容易混淆变数定义。
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