初二数学 分式方程

2025-01-01 07:09:22
推荐回答(4个)
回答1:

1、设汽车先行驶的速度x千米/小时
120/x=135/(x+5)
解得
x=40 x+5=45
2、设原计划用x个月完成这项工程
1/(x-3)=(1+12%)/x
解得
x=28
3.设工期是x。
甲一天做1/x,乙一天做1/(x+5)
根据方案三:4/x+x/(x+5)=1
解得x=20
方案一:20*1.5=30
方案二:25*1.1=27.5
方案三:4*1.5+20*1.1=26
方案三满足要求

回答2:

1、设汽车先行驶的速度x千米/小时,则后行驶速度为(x+5)千米/小时
120/x=135/(x+5)
x=40 x+5=45
2、设原计划用x个月完成这项工程
1/(x-3)=(1+12%)/x
x=28
3、方案3

回答3:

1或者2或者3

回答4:

1.(135-120)/5=3
2.3/(1-1/1.12)=28
3.设工期是x。
甲一天做1/x,乙一天做1/(x+5)
根据方案三:4/x+x/(x+5)=1 得到x=20
方案一:20*1.5=30
方案二:25*1.1=27.5
方案三:4*1.5+20*1.1=26
方案三满足要求

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