十字相乘因式分解的几道计算题1.x^2+2x-82.x^2+3x-103.x^2-x-204.x^2+x-65.2x^2+5x-36.6x^2+4x-27.x^2-2x-38.x^2+6x+89.x^2-x-1210.x^2-7x+1011.6x^2+x+212.4x^2+4x-3
问题描述:
十字相乘因式分解的几道计算题
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
答
1.x^2+2x-8 (x-2)(x+4)-2*4=-8;-2+4=22.x^2+3x-10(x+5)(x-2)5*(-2)=-10;-2+5=33.x^2-x-20 (x-5)(x+4)-5*4=-20;-5+4=-14.x^2+x-6 (x-2)(x+3)-2*3=-6;-2+3=15.2x^2+5x-3 (2x-1)(x+3)-1*3=-3;2*3+(-1)*1=56.6...