(x+y)²+6(x+y)+9 a²-2a(b+c)+(b+c)² 4xy-4x²y-y³ -a+2(x+y)²+6(x+y)+9a²-2a(b+c)+(b+c)²4xy-4x²y-y³-a+2a²-a³
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/24 18:33:14
![(x+y)²+6(x+y)+9 a²-2a(b+c)+(b+c)² 4xy-4x²y-y³ -a+2(x+y)²+6(x+y)+9a²-2a(b+c)+(b+c)²4xy-4x²y-y³-a+2a²-a³](/uploads/image/z/1979415-63-5.jpg?t=%28x%2By%29%26%23178%3B%2B6%28x%2By%29%2B9+a%26%23178%3B%EF%BC%8D2a%28b%2Bc%29%2B%28b%2Bc%29%26%23178%3B+4xy%EF%BC%8D4x%26%23178%3By%EF%BC%8Dy%26%23179%3B+%EF%BC%8Da%EF%BC%8B2%28x%2By%29%26%23178%3B%2B6%28x%2By%29%2B9a%26%23178%3B%EF%BC%8D2a%28b%2Bc%29%2B%28b%2Bc%29%26%23178%3B4xy%EF%BC%8D4x%26%23178%3By%EF%BC%8Dy%26%23179%3B%EF%BC%8Da%EF%BC%8B2a%26%23178%3B%EF%BC%8Da%26%23179%3B)
(x+y)²+6(x+y)+9 a²-2a(b+c)+(b+c)² 4xy-4x²y-y³ -a+2(x+y)²+6(x+y)+9a²-2a(b+c)+(b+c)²4xy-4x²y-y³-a+2a²-a³
(x+y)²+6(x+y)+9 a²-2a(b+c)+(b+c)² 4xy-4x²y-y³ -a+2
(x+y)²+6(x+y)+9
a²-2a(b+c)+(b+c)²
4xy-4x²y-y³
-a+2a²-a³
(x+y)²+6(x+y)+9 a²-2a(b+c)+(b+c)² 4xy-4x²y-y³ -a+2(x+y)²+6(x+y)+9a²-2a(b+c)+(b+c)²4xy-4x²y-y³-a+2a²-a³
(x+y)²+6(x+y)+9=(x+y+3)²
a²-2a(b+c)+(b+c)²=[a-(b+c)]²=(a-b-c)²
4xy-4x²y-y³=-y(4x²-4xy+y²)=-y(2x-y)²
-a+2a²-a³=-a(1-2a+a²)-a(1-a)²
因式分解?