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若三角形在平面的同側,此時到△ABC的三個頂點距離均為1cm的平面的平面有兩個.因為正三角形的邊長為3,所以三角形的高為332>2,所以當平面經過中位線EF時,根據線面平行的性質可知,此時有兩個平面到△ABC的三個頂…
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