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(中向量的概念)已知直线x+y=a与圆x2+y2=4交于A、B两点,且,其中O为原点,求实...
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(中向量的概念)已知直线x+y=a与圆x
2+y
2=4交于A、B两点,且
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAI4AAAAWCAYAAAAWyKQmAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAK2SURBVGhD7VpJksMgDPS7cvBzcvdPcvZD5uqH
5OCnMBi8sEhIGmC8FKmaS4xRq2kaiUynqn2+6vP+qG+1+amJz45P4aOen40/Hb+j4Gc9/37U6/2T
NUXWy2fHzwKvXz4bfyK+J5yu61T5v5f6MG2nfOwlH3783HU+G/9/xm+Ok6uWmu/fxXHKcnDtM7ps
rjVmuzZ/2nEmNQxTjcwvOmfpfEvPd1HaDKwj1yac7HVqwsmmUDTBNKhzjA5eaElh6efZhAOs+6zG
3u+0+nEm9DGpkRyzuB5HOHT8aQA6wX5UOMrSC52aj8Yfk8nkj7VL6fgy/hhH1Tz2pjX3XEEvdvSd
l4AFSouLFo4kvhm7A9XJLdcKqJ39j3Ak+A8KBfwRwpHE5/NHCMcG7RVkHEahyI4GwToJgure744G
XXrZjyy+JdvViYlzonBk+B3ZQJuVy5+Tryy+hL+UcOZR9XoxMddAhaPfG0Zts8EiohsDO6qk8c14
nugslso1jhT/RpCUP4xYaXwRfwnhWFc4FsLHt56ZkePoCc13yzEBO1WUJyIcafzN5bbilj4m6x5V
Uvy7mKX8IcKRxpfxhwqHqA8QNU/DKrRAvcljGBSONH5gs8RuSzkOq9YEB7lClOJfEf2FPwxLqr6L
+JHyhwmHY3OBG4WKxd0qyBQSjjQ+INT0jsOPqiLCkeLf6zm3M8TcnoFQGl/MH+E4oN1DHZU5l+cj
o2VMshWmkrc7lhvf7wZMWW2vD05rx2X4dRdwM/4SNQ5UkW/dkNeoLGoNFsi8myUcuKMC468iibqp
8AohLq4K/8Ti10zP5o/Vjjv26SvGuRTcCuHwoinDbiH7Dlvr1f3i215OYV63ODa+t7bVO77H8Me4
AKQOlfs+ry+c+3JDIfeEQw1uzxsDMQN1/5GrMf5YBppwHru0dRP7BT9z0GX6/OIAAAAAAElFTkSu
QmCC
)
,其中O为原点,求实数a的值.
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已知直线x+y=a与圆x2+y2=4交于A、B两点,O是坐标原点,向量
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或-![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAASCAYAAACEnoQPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
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o7JvgMWGp7gBk1Mvrs8eNuwRlmZALiCl1EDBAtpwtPO4ntIMZ0o8TG1cspsCYX/utviUtK9PNnh2
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已知直线x+y=a与圆x2+y2=4交于A、B两点,O是坐标原点,向量
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或-![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAA8AAAASCAYAAACEnoQPAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAMZJREFU
OE/VU9sNhSAMLRuxD1swBEuwAwMwB4k7sERvSysKmkj4u/1C7Ol5WA1SwVTGmPnq/ZnBc1Hn2/Wz
70/ANaMnSwAec6WsVmXX7DvoxKyBSyRgxDIxLYArZg8YIw9gyXTWKd9gZY1FEHf5n+DW7DNSPloF
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j/o+wWVgUaIzJclAbQyJOkFTn2GpNJ8t7XFlk2dXNkX9G17/JhN8eAMy/h0s/UX9lXL/Zq9pryeu
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D.2或-2