因式分解 十字相乘法 答案

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1、x2+2x+1=(x+1)2x2+3x+2=(x+1)(x+2)x2-1=(x+1)(x-1)x2-2x-3=(x+1)(x-3)x2+7x+6=(x+1)(x+6)2x2+3x+1=(x+1)(2x+1)2x2+4x+2=2(x+1)22x2+x-1=(x+1)(2x-1)2x2-x-3=(x+1)(2x-3)2x2+8x+6=2(x+1)(x+3)3x2+4x+1=(x+1)(3x+1)3x2+5x+2=(x+1)(3x+2)3x2+2x-1=(x+1)(3x-1)3x2-3=3(x+1)(x-1)3x2

2、+9x+6=3(x+1)(x+2)-x2+1=-(x+1)(x-1)-x2+x+2=-(x+1)(x-2)-x2-2x-1=-(x+1)2-x2-4x-3=-(x+1)(x+3)-x2+5x+6=-(x+1)(x-6)x2+3x+2=(x+1)(x+2)x2+4x+4=(x+2)2x2+x-2=(x+2)(x-1)x2-x-6=(x+2)(x-3)x2+8x+12=(x+2)(x+6)2x2+5x+2=(x+2)(2x+1)2x2+6x+4=2(x+1)(x+2)2x2+3x-2=(x+2)(2x-1)2x2

3、+x-6=(x+2)(2x-3)2x2+10x+12=2(x+2)(x+3)3x2+7x+2=(x+2)(3x+1)3x2+8x+4=(x+2)(3x+2)3x2+5x-2=(x+2)(3x-1)3x2+3x-6=3(x+2)(x-1)3x2+12x+12=3(x+2)2-x2-x+2=-(x+2)(x-1)-x2+4=-(x+2)(x-2)-x2-3x-2=-(x+1)(x+2)-x2-5x-6=-(x+2)(x+3)-x2+4x+12=-(x+2)(x-6)x2-1=(x+1)(x-1)x2+x-2=(x

4、+2)(x-1)x2-2x+1=(x-1)2x2-4x+3=(x-1)(x-3)x2+5x-6=(x-1)(x+6)2x2-x-1=(x-1)(2x+1)2x2-2=2(x+1)(x-1)2x2-3x+1=(x-1)(2x-1)2x2-5x+3=(x-1)(2x-3)2x2+4x-6=2(x-1)(x+3)3x2-2x-1=(x-1)(3x+1)3x2-x-2=(x-1)(3x+2)3x2-4x+1=(x-1)(3x-1)3x2-6x+3=3(x-1)23x2+3x-6=3(x+2)(x-1)-x2+2x-1

5、=-(x-1)2-x2+3x-2=-(x-1)(x-2)-x2+1=-(x+1)(x-1)-x2-2x+3=-(x-1)(x+3)-x2+7x-6=-(x-1)(x-6)x2-2x-3=(x+1)(x-3)x2-x-6=(x+2)(x-3)x2-4x+3=(x-1)(x-3)x2-6x+9=(x-3)2x2+3x-18=(x-3)(x+6)2x2-5x-3=(x-3)(2x+1)2x2-4x-6=2(x+1)(x-3)2x2-7x+3=(x-3)(2x-1)2x2-9x+9=(x-3)(2x-3)2x2-18

6、=2(x-3)(x+3)3x2-8x-3=(x-3)(3x+1)3x2-7x-6=(x-3)(3x+2)3x2-10x+3=(x-3)(3x-1)3x2-12x+9=3(x-1)(x-3)3x2-3x-18=3(x+2)(x-3)-x2+4x-3=-(x-1)(x-3)-x2+5x-6=-(x-3)(x-2)-x2+2x+3=-(x+1)(x-3)-x2+9=-(x-3)(x+3)-x2+9x-18=-(x-3)(x-6)x2+7x+6=(x+1)(x+6)x2+8x+12=(x+2)(x+6)x2+5x-6

7、=(x-1)(x+6)x2+3x-18=(x-3)(x+6)x2+12x+36=(x+6)22x2+13x+6=(x+6)(2x+1)2x2+14x+12=2(x+1)(x+6)2x2+11x-6=(x+6)(2x-1)2x2+9x-18=(x+6)(2x-3)2x2+18x+36=2(x+6)(x+3)3x2+19x+6=(x+6)(3x+1)3x2+20x+12=(x+6)(3x+2)3x2+17x-6=(x+6)(3x-1)3x2+15x-18=3(x-1)(x+6)3x2+24x+36=3(x+2)(

8、x+6)-x2-5x+6=-(x-1)(x+6)-x2-4x+12=-(x+6)(x-2)-x2-7x-6=-(x+1)(x+6)-x2-9x-18=-(x+6)(x+3)-x2+36=-(x+6)(x-6)2x2+3x+1=(x+1)(2x+1)2x2+5x+2=(x+2)(2x+1)2x2-x-1=(x-1)(2x+1)2x2-5x-3=(x-3)(2x+1)2x2+13x+6=(x+6)(2x