Question

已知M={y|y=x²}，N={y|x²+y²=2}，则M∩N=______．

Answer 1

M={y|y=x²}={y|y≥0}，N={y|x²+y²=2}={y|-

2

≤ y≤

2

}，故M∩N={y|0≤y≤

2

}
故答案为：{y|0≤y≤

2

}