抛物线y=x²-2x-1与坐标轴有几个交点？
\u629b\u7269\u7ebfy=x2-2x+1\u4e0e\u5750\u6807\u8f74\u4ea4\u70b9\u4e2a\u6570\u4e3a______\u5f53x=0\u65f6\uff0cy=1\uff0c\u5219\u4e0ey\u8f74\u7684\u4ea4\u70b9\u5750\u6807\u4e3a\uff080\uff0c1\uff09\uff1b\u5f53y=0\u65f6\uff0cx2-2x+1=0\uff0c\u89e3\u5f97x1=x2=1\uff0e\u5219\u4e0ex\u8f74\u7684\u4ea4\u70b9\u5750\u6807\u4e3a\uff081\uff0c0\uff09\uff1b\u7efc\u4e0a\u6240\u8ff0\uff0c\u629b\u7269\u7ebfy=x2-2x+1\u4e0e\u5750\u6807\u8f74\u4e00\u5171\u67092\u4e2a\u4ea4\u70b9\uff0e\u6545\u7b54\u6848\u4e3a2\uff0e
y=-x²+2x-3
=-(x²-2x+3)
=-[(x-1)²+2]
=-(x-1)²-2
\u51fd\u6570\u7684\u6700\u5927\u503c\u4e3a-2
\u51fd\u6570\u56fe\u8c61\u4e0ex\u8f74\u65e0\u7126\u70b9
1个
2
亲，两个，祝你快乐
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