百科知识

x2+y2-2xy-6x+6y+9因式分解

2006-09-17 19:02:40z***
x2+y2-2xy-6x+6y+9因式分解:a^2+b^2-2ab-6a+6b+9 =(a^2+b^2-2ab)-6(a-b)+9 =(a-b)^2-6(a?

最佳回答

  • a^2+b^2-2ab-6a+6b+9 =(a^2+b^2-2ab)-6(a-b)+9 =(a-b)^2-6(a-b)+3^2 =(a-b-3)^2
    2006-09-17 21:04:42
  • a^2+b^2-2ab-6a+6b+9 =(a-b)^2-6(a-b)+9 =(a-b-3)^2
    2006-09-17 19:19:33
  • 很赞哦! (249)