(x+3)²-(x-3)×(x-5)=16

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答：(x+3)2-(x-3)(x-5)=16(x+3)2-16=(x-3)(x-5)(x+3-4)(x+3+4)=(x-3)(x-5)(x-1)(x+7)=(x-3)(x-5)x2+6x-7=x2-8x+1514x=22x=11/7...

千问 | 2013-6-14 16:36:51 | 显示全部楼层

(x+3)^2-(x-3)(x-5)=16x^2+6x+9-x^2+8x-15=16x^2-x^2+6x+8x=16+15-914x=22x=11/7...

千问 | 2013-6-14 16:36:51 | 显示全部楼层

(x+3)2-(x-3)(x-5)=16x^2+6x+9-x^2+5x+3x-15=16x^2-x^2+6x+8x=16+15-914x=22x=11/7...

千问 | 2013-6-14 16:36:51 | 显示全部楼层

(x+3)2-(x-3)×(x-5)=16x2+6x+9-(x2-8x+15)=16x2+6x+9-x2+8x-15=1614x=22x=11/7...

千问 | 2013-6-14 16:36:51 | 显示全部楼层

(x+3)2-(x-3)×(x-5)=16x2+6x+9-(x2-8x+15)=1614x-6=1614x=22x=11/7...

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