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运用因式分解解题 ①8.3×201.3+3.6×201.3-1.9×201.3 ②20²-20×38+19² ² 是 平方
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①8.3×201.3+3.6×201.3-1.9×201.3
=201.3(8.3+3.6-1.9)
=201.3*10
=2013
20²-20×38+19²
=﹙20-19﹚²
=1
=201.3(8.3+3.6-1.9)
=201.3*10
=2013
20²-20×38+19²
=﹙20-19﹚²
=1
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