因式分解 C= 16x^2-40x+25-(6x-10)(5x-4)+4x-5

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因式分解 C= 16x^2-40x+25-(6x-10)(5x-4)+4x-5
因式分解 C= 16x^2-40x+25-(6x-10)(5x-4)+4x-5

因式分解 C= 16x^2-40x+25-(6x-10)(5x-4)+4x-5
原式=16x²-40x+25-30x²+74x-40+4x-5
=-14x²+38x-20
=-2(7x²-19x+10)
=-2(7x-5)(x-2)