分解因式(1) 5x²+6x-8 (2) 15x²+x-2 (3)a²b²-7ab+12 (4)7x²-19x-6(5)4x²+15x+9 (6)x²-6xy+8y² (7) 7(x+y)³-5(x+y)²-2(x+y) (8) x²-2xy+y²-5x+5y-6
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/28 14:35:06
![分解因式(1) 5x²+6x-8 (2) 15x²+x-2 (3)a²b²-7ab+12 (4)7x²-19x-6(5)4x²+15x+9 (6)x²-6xy+8y² (7) 7(x+y)³-5(x+y)²-2(x+y) (8) x²-2xy+y²-5x+5y-6](/uploads/image/z/1266766-70-6.jpg?t=%E5%88%86%E8%A7%A3%E5%9B%A0%E5%BC%8F%EF%BC%881%EF%BC%89+5x%26%23178%3B%2B6x-8+%EF%BC%882%EF%BC%89+15x%26%23178%3B%2Bx-2+%EF%BC%883%EF%BC%89a%26%23178%3Bb%26%23178%3B-7ab%2B12+%284%297x%26%23178%3B-19x-6%285%294x%26%23178%3B%2B15x%2B9++%286%29x%26%23178%3B-6xy%2B8y%26%23178%3B++%EF%BC%887%29++7%28x%2By%29%26%23179%3B-5%EF%BC%88x%2By%EF%BC%89%26%23178%3B-2%EF%BC%88x%2By%29+++%EF%BC%888%EF%BC%89+x%26%23178%3B-2xy%2By%26%23178%3B-5x%2B5y-6)
分解因式(1) 5x²+6x-8 (2) 15x²+x-2 (3)a²b²-7ab+12 (4)7x²-19x-6(5)4x²+15x+9 (6)x²-6xy+8y² (7) 7(x+y)³-5(x+y)²-2(x+y) (8) x²-2xy+y²-5x+5y-6
分解因式(1) 5x²+6x-8 (2) 15x²+x-2 (3)a²b²-7ab+12 (4)7x²-19x-6
(5)4x²+15x+9 (6)x²-6xy+8y² (7) 7(x+y)³-5(x+y)²-2(x+y) (8) x²-2xy+y²-5x+5y-6
分解因式(1) 5x²+6x-8 (2) 15x²+x-2 (3)a²b²-7ab+12 (4)7x²-19x-6(5)4x²+15x+9 (6)x²-6xy+8y² (7) 7(x+y)³-5(x+y)²-2(x+y) (8) x²-2xy+y²-5x+5y-6
(1) 5x^2+6x-8=(5x-4)*(x+2)
(2) 15x^2+x-2=(3x-1)(5x+2)
(3) a^2b^2-7ab+12=(ab-3)(ab-4)
(4) 7x^2-19x-6=(7x+2)(x-3)
(5) 4x^2+15x+9=(4x+3)(x+3)
(6) x^2-6xy+8y^2=(x-2y)(x-4y)
(7) 7(x+y)^3-5(x+y)^2-2(x+y)
=(x+y)[7(x+y)^2-5(x+y)-2]
=(x+y)(7x+7y+2)(x+y-1)
(8) x^2-2xy+y^2-5x+5y-6
=(x^2-2xy+y^2)-5(x-y)-6
=(x-y)^2-5(x-y)-6
=(x-y-6)(x-y+1)