十字相乘法解题1)2x2-5x-12; (2)3x2-5x-2; (3)6x2-13x+5; (4)7x2-19x-6; (5)12x2-13x+3; (6)4x2+24x+27.(1)6x2-13xy+6y2; (2)8x2y2+6xy-35; (3)18x2-21xy+5y2

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十字相乘法解题1)2x2-5x-12; (2)3x2-5x-2; (3)6x2-13x+5; (4)7x2-19x-6; (5)12x2-13x+3; (6)4x2+24x+27.(1)6x2-13xy+6y2; (2)8x2y2+6xy-35; (3)18x2-21xy+5y2

十字相乘法解题1)2x2-5x-12; (2)3x2-5x-2; (3)6x2-13x+5; (4)7x2-19x-6; (5)12x2-13x+3; (6)4x2+24x+27.(1)6x2-13xy+6y2; (2)8x2y2+6xy-35; (3)18x2-21xy+5y2
十字相乘法解题
1)2x2-5x-12; (2)3x2-5x-2;
(3)6x2-13x+5; (4)7x2-19x-6;
(5)12x2-13x+3; (6)4x2+24x+27.
(1)6x2-13xy+6y2; (2)8x2y2+6xy-35;
(3)18x2-21xy+5y2

十字相乘法解题1)2x2-5x-12; (2)3x2-5x-2; (3)6x2-13x+5; (4)7x2-19x-6; (5)12x2-13x+3; (6)4x2+24x+27.(1)6x2-13xy+6y2; (2)8x2y2+6xy-35; (3)18x2-21xy+5y2
2x2-5x-12=(2x+3)*(x-4) 3x2-5x-2=(3x+1)*(x-2)
6x2-13x+5=(2x-1)*(3x-5) 7x2-19x-6=(x-3)*(7x+1)
12x2-13x+3=(2x-1)*(6x-3) 4x2+24x+27=(2x+9)*(2x+3)
6x2-13xy+6y2=(2x-3y)*(3x-2y) 8x2y2+6xy-35=(2xy-5)*(4xy+7)
18x2-21xy+5y2=(3x-y)*(6x-5y)