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;
(4)3a2-7a-6;
(5)6x2-11xy+3y2;
(6)4m2+8mn+3n2;
(7)10x2-21xy+2y2;
(8)8m2-22mn+15n2.
(1)4n2+4n-15;
(2)6a2+a-35;
(3)5x2-8x-13;
(4)4x2+15x+9
(5)15x2+x-2;
(6)6y2+19y+10;
(7)20-9y-20y2;
(8)7(x-1)
2+4(x-1)(y+2)-20(y+2)
1.x^2+2x-8
2.x^2+3x-10
3.x^2-x-20
4.x^2+x-6
5.2x^2+5x-3
6.6x^2+4x-2
7.x^2-2x-3
8.x^2+6x+8
9.x^2-x-12
10.x^2-7x+10
11.6x^2+x+2
12.4x^2+4x-3