![](https://iknow-base.cdn.bcebos.com/lxb/notice.png)
已知x的2次方-xy=60,xy-y的2次方=40,求代数式x的2次方-y的2次方和x的2次方-2xy+y的2次方
2个回答
展开全部
x^2-xy=60.....(1)
xy-y^2=40....(2)
(1)+(2)得x^2-y^2=60+40=100;
(1)-(2)得X^2-2XY+Y^2=60-40=20
xy-y^2=40....(2)
(1)+(2)得x^2-y^2=60+40=100;
(1)-(2)得X^2-2XY+Y^2=60-40=20
推荐律师服务:
若未解决您的问题,请您详细描述您的问题,通过百度律临进行免费专业咨询