因式分解(1)2x^2+11x+15 (2)12x^2-7x+1 (3) 12x^2-4x-1

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因式分解(1)2x^2+11x+15(2)12x^2-7x+1(3)12x^2-4x-1因式分解(1)2x^2+11x+15(2)12x^2-7x+1(3)12x^2-4x-1因式分解(1)2x^2+

因式分解(1)2x^2+11x+15 (2)12x^2-7x+1 (3) 12x^2-4x-1
因式分解(1)2x^2+11x+15 (2)12x^2-7x+1 (3) 12x^2-4x-1

因式分解(1)2x^2+11x+15 (2)12x^2-7x+1 (3) 12x^2-4x-1
(1)2x^2+11x+15
=(x+3)(2x+5)
(2)12x^2-7x+1
=(3x-1)(4x-1)
(3) 12x^2-4x-1
=(2x-1)(6x+1)

三道题均用十字相乘法!
⑴2x∧2+11x+15
=(x+3)(2x+5)
⑵12x∧2-7x+1
=(3x-1)(4x-1)
⑶12x∧2-4x-1
=(2x-1)(6x+1)
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