2x^2-5x-4怎么因式分解
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2x^2-5x-4怎么因式分解
2x^2-5x-4怎么因式分解
2x^2-5x-4怎么因式分解
2x^2-5x-4
=2(x^2-5x/2)-4
=2(x^2-5x/2+25/16)-50/16-4
=2(x-5/4)^2-114/16
=2[(x-5/4)^2-57/16]
=2(x-5/4-√57/4)(x-5/4+√57/4)