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因式分解 : 十字相乘法

因式分解 : 十字相乘法. www.elabhk.net. 十字相乘法. 1) x 2 + 5x + 4. = (x +1)(x +4). 2) - x 2 - 5x - 4. = -(x 2 +5x +4)=…. 3) 4 + 5x - x 2. = -x 2 +5x +4=…. 4) 2 x 2 + 5x + 2. = (2x +1)(x +2). 5) 6 x 2 + 15 x + 6. = 3(2x 2 +5x +2). 6) 2x 2 + 5x y + 2 y 2. = (2x + y)(x + 2y). 十字相乘法.

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因式分解 : 十字相乘法

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  1. 因式分解 : 十字相乘法 www.elabhk.net

  2. 十字相乘法 1) x2 + 5x + 4 = (x+1)(x +4) 2) -x2- 5x - 4 = -(x2 +5x +4)=… 3) 4 + 5x - x2 = -x2 +5x +4=… 4) 2x2 + 5x + 2 = (2x+1)(x +2) 5) 6x2 + 15x + 6 = 3(2x2 +5x +2) 6) 2x2 + 5xy + 2y2 = (2x+ y)(x + 2y)

  3. 十字相乘法 因式分解: 思考 -8 - 20x -8x2 = -8x2 - 20x - 8 1. 排位 = -(8x2 +20x +8) 2. x2項有負數? = -4(2x2 +5x +2) 3. H.C.F. = -4(2x+1)(x+2) 4. 十字相乘法

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