A man is thinking about travelling in China by bike.His fron

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A man is thinking about travelling in China by bike.His front tyre(前胎) and back tyre(后胎) can ex
A man is thinking about travelling in China by bike.His front tyre(前胎) and back tyre(后胎) can exchange(互换).If a new tyre is used for the front wheel(前轮)，it runs 3000 km at most(至多).If it is used for the back wheel(后轮)，it runs 2000km at most.If he uses two new tyres,his bike runs ___________km at most.

x+(2000-x)*3/2=(3000-x)*2/3+x(要走最远2轮要同时耗尽,x代表轮子1作为后轮时行驶的路程)
解得：x=1200
sum=1200+（2000-1200）*3/2=2400
2400

A man is thinking about travelling in China by bike.His fron 英语翻译in china,by a bike is the most popular means of transpor The boy ___the bike is my brother A.on B.by C.in D.about Rice is grown in Southouse China （）them.A.by B.in C.about D 单项选择 1 The man the black bike is his father. A in B on C in He__something about China in English in his letter A speaks the man ()is Jim's brother.A by the bike B on bike C on the Maria is fron Cuba?改为否定句 Yes,I am.What about you?的下一句 China A man was travelling abroad in a small red car. a bird is knwon by its note,a man is known by his talk The bus stop is not far from here ,it is about < >by bike .A Life consists in what a man is thinking of all day.