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  5. 何故赤ペンの答えになるのか教えてください🙏
Mathematics
Senior High
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何故赤ペンの答えになるのか教えてください🙏

(x-3)第二項定理を使う。 (31_3 Cox² + 3C1x". (-3)' + 5 (2x². (-3)² + 5 C3x². (-7)³-3 (2x-(-?) +765 (-3) = x²-13x² + 90x³-270x4403x-243

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