9x²+6xy+y²-14(3x+y)+49
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/04 12:47:01
![9x²+6xy+y²-14(3x+y)+49](/uploads/image/z/1805884-52-4.jpg?t=9x%26%23178%3B%2B6xy%2By%26%23178%3B-14%EF%BC%883x%2By%29%2B49)
9x²+6xy+y²-14(3x+y)+49
9x²+6xy+y²-14(3x+y)+49
9x²+6xy+y²-14(3x+y)+49
9x²+6xy+y²-14(3x+y)+49
=(3x+y)²-2×7×(3x+y)+7²
=(3x+y-7)²
9x²+6xy+y²-14(3x+y)+49
=(3x+y)²-14(3x+y)+49
=[(3x+y)-7]²
=(3x+y-7)²