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  • 我们到郊外去旅行

    下周我们将去野外旅游.
    首先设X小时追上4X+4是追上时前队被追上时走的距离6X则是后队追上前队时走的距离就是4X+4=6X解得X=2再算自行车走的距离就是12*2=24km往4/(12-4)=1/2

    2018-07-13 04:48:34 26
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