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（贵阳专用）2019中考数学总复习第1部分教材同步复习第一章数与式课时2整式（含因式分解）权威预测.doc

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1第一部分 第一章 课时 21若 m n1，则( m n)22 m2 n_3_.2先化简，再求值： a(a22 a4)2( a1) 2，其中 a3.解：原式 a32 a24 a2 a24 a2 a32.当 a3 时，原式27229.

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