你看到字母后面有莫名其妙2的都是平方!是在网上找的。
(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;
(4)2(a+b)
2+(a+b)(a-b)-6(a-b)
2.
(1)2x2+3x+1;
(2)2y2+y-6;
(3)6x2-13x+6;...
1.用十字相乘法分解因式:
(1)2x2-5x-12; (2)3x2-5x-2;
(3)6x2-13x+5; (4)7x2-19x-6;
(5)12x2-13x+3; (6)4x2+24x+27.
2.把下列各式分解因式:
(1)6x2-13xy+6y2; (2)8x2y2+6xy-35;
(3)18x2-21xy+5y2; (4)2(a+b) 2+(a+b)(a-b)-6(a-b) 2.
答案:
1.(1)(x-4...
.用十字相乘法分解因式:
(1)2x2-5x-12; (2)3x2-5x-2;
(3)6x2-13x+5; (4)7x2-19x-6;
(5)12x2-13x+3; (6)4x2+24x+27.
2.把下列各式分解因式:
(1)6x2-13xy+6y2; (2)8x2y2+6xy-35;
(3)18x2-21xy+5y2; (4)2(a+b) 2+(a+b)(a-b)-6(a-b) 2.
答案:
1.(1)(x-4)...
标签:练习题,乘法,十字