已知xy是有理数,并且满足等式x平方减2y减根号2y等于17加4倍根号2,求x加y的值

2024-12-16 07:53:36
推荐回答(1个)
回答1:

x²-2y+(√2)y=17-4√2
=>x²-2y=17 ,y=-4
=>x²=9
=>x=3或-3
=>x+y=-1或-7