已知抛物线y=-x2+(m2-5m+6)x+m2-9的图像的对称轴为y轴,且顶点在原点,求m
人气:313 ℃ 时间:2020-05-19 05:18:22
解答
m2-5m+6=0,解得m=2或m=3
m²-9=0,解得m=±3
所以m=3
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