如图，已知一次函数y=-x+3的图象与x轴，y轴分别相交于A，B两点，点C在AB上以每秒1个单位的速度从点A向点B运动，同时点D在线段AO上以同样的速度从点O向点A运动，运动时间用t（-九年级数学

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