客车以80km/h的速度从甲地开往乙地,1h后轿车也从甲地出发以120km/h的速度追赶客车 ,求追上客车所需时间.
用一元一次方程解
人气：375 ℃ 时间：2019-08-18 10:49:07
解答
设追上客车X小时
80+80x=120x
80x-120x=-80
-40x=-80
x=2
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