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
问题描述:
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
答
(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+...