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R, S, T, and U are points on a line, and U is the midpoint of line segment ST. If the lengths of line segments RS, RT, and ST are 20, 4, and 24, respectively. What is the length of line segment RU?
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根据文章意思，画图的时候这四个点的先后顺序应该是 S U R T
SR=20,RT=4 u是中点，那么UT=12，RT=4,则UR=8
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