题干

把一根木料锯成3段要3.6分钟,锯成5段要____分钟.
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7.2

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                                                                                              七律·长征
                                                                                           红军不怕远征难,
                                                                                           万水千山只等闲。
                                                                                           五岭逶迤腾细浪,
                                                                                           乌蒙磅礴走泥丸。
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                                                                                           大渡桥横铁索寒。
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                                                                                           三军过后尽开颜。