12道数学题 3-73、已知等边三角形ABC的两个顶点为A(-4,0),B(2,0),求点C的坐标.4、某人乘船由A地顺流而下到B地,然后逆流而上到C地,共乘船7小时,已知船在静水中的速度为7.5千米/
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