问题补充:
单选题若x+y=10,xy=24,则x2+y2的值是A.52B.148C.58D.76
答案:
A解析x2+y2=(x+y)2-2xy=1002-2×24=52.
时间:2021-10-12 09:09:17
单选题若x+y=10,xy=24,则x2+y2的值是A.52B.148C.58D.76
A解析x2+y2=(x+y)2-2xy=1002-2×24=52.
单选题已知=(2 3 5) =(3 x y) 若∥ 则A.B.x=9 y=15C.D.
2024-08-07
单选题已知x+y=-5 xy=6 则x2+y2的值是A.1B.13C.17D.25
2020-08-13