如果x+y=5,xy=0,则x²y+xy²=?x²-xy+y²=?
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/29 23:19:13
![如果x+y=5,xy=0,则x²y+xy²=?x²-xy+y²=?](/uploads/image/z/629283-3-3.jpg?t=%E5%A6%82%E6%9E%9Cx%2By%3D5%2Cxy%3D0%2C%E5%88%99x%26%23178%3By%2Bxy%26%23178%3B%3D%3Fx%26%23178%3B-xy%2By%26%23178%3B%3D%3F)
如果x+y=5,xy=0,则x²y+xy²=?x²-xy+y²=?
如果x+y=5,xy=0,则x²y+xy²=?x²-xy+y²=?
如果x+y=5,xy=0,则x²y+xy²=?x²-xy+y²=?
x+y=5,xy=0,则
x²y+xy²
=xy ( x+y)
= 0 x 5
= 0
x²-xy+y²
= x²+2xy+y² -3xy
=(x+y ) ² -3xy
= 5x5 - 0
= 25