专题一:十字相乘法分解因式 (1)x7x6 (2)x13x36 (3)x5x24 (4)x2x15 (5)x2x3 (6)xxy16y (7)(xx)8(xx)12 例2:把下列各因式分解: 2(1)12x5x2 (2)5x6xy8y 222222222222 2(3)6x7x3 (4)8x26xy15y 22 22(5)5ab23ab10 (6)3ab17abxy10xy 2222 (7)(a8a)22(a8a)120 (8)(x2x3)(x2x24)90 22(9)4m8mn3n (10)6y11y10 222222 一、相乘分解因式: 分解因式:x23x2 x23x2 x22x3 x22x3 x25x6 x25x6 x25x6 x25x6 x2x2 x24x12 x22x63 x28x15 1 / 3 x212x32 x210x9 x23x10 x22x15 分解因式: 2x25x2 2x25x3 2x23x20 2x25x7 2x27x3 2x27x3 2x27x6 2x27x6 3x27x6 3x28x3 3x25x2 5x23x2 5x26x8 6x25x25 6x27x3 分解因式: x2xa2a x34x221x 3x310x23x x46x227 x410x29 (2x3)23(2x3)2 (x28x)222(x28x)120 二、用因式分解法解下列方程 (1) a2-7a+6=0; (2)8x2+6x-35=0; (3)18x2-21x+5=0; (4) 20-9y-20y2=0; (5)2x2+3x+1=0; (6)2y2+y-6=0; (7)6x2-13x+6=0; (8)3a2-7a-6=0; (9)6x2-11x+3=0; (10)4m2+8m+3=0; 2 / 3 本文来源:https://www.wddqw.com/doc/3d985dc4ad1ffc4ffe4733687e21af45b207fe01.html