a+b=5,a²+b²=19则:ab=( ),(a-b)²=?我初=,单独解a,b的值没学.还有:4x²-2kx+1是完全平方式,
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/24 18:23:55
![a+b=5,a²+b²=19则:ab=( ),(a-b)²=?我初=,单独解a,b的值没学.还有:4x²-2kx+1是完全平方式,](/uploads/image/z/550938-66-8.jpg?t=a%EF%BC%8Bb%EF%BC%9D5%2Ca%26%23178%3B%EF%BC%8Bb%26%23178%3B%EF%BC%9D19%E5%88%99%EF%BC%9Aab%EF%BC%9D%EF%BC%88%E3%80%80%E3%80%80%E3%80%80%EF%BC%89%2C%28a%EF%BC%8Db%29%26%23178%3B%EF%BC%9D%3F%E6%88%91%E5%88%9D%EF%BC%9D%2C%E5%8D%95%E7%8B%AC%E8%A7%A3a%2Cb%E7%9A%84%E5%80%BC%E6%B2%A1%E5%AD%A6.%E8%BF%98%E6%9C%89%EF%BC%9A4x%26%23178%3B%EF%BC%8D2kx%EF%BC%8B1%E6%98%AF%E5%AE%8C%E5%85%A8%E5%B9%B3%E6%96%B9%E5%BC%8F%2C)
a+b=5,a²+b²=19则:ab=( ),(a-b)²=?我初=,单独解a,b的值没学.还有:4x²-2kx+1是完全平方式,
a+b=5,a²+b²=19则:ab=( ),(a-b)²=?
我初=,单独解a,b的值没学.
还有:
4x²-2kx+1是完全平方式,
a+b=5,a²+b²=19则:ab=( ),(a-b)²=?我初=,单独解a,b的值没学.还有:4x²-2kx+1是完全平方式,
(a+b)²=a²+b²+2ab=25 ab=(25-19)/2=3
(a-b)²=a²+b²-2ab=19-6=13
k=2