（160-130）*x+(120-100)*(100-x)≥2580
30x+20(100-x)≥2580
30x+2000-20x≥2580
10x+2000≥2580
10x≥2580-2000
10x≥580
x≥58
（160-130）*x+(120-100)*(100-x)≥2580 怎么算,要求完整過程
（160-130）*x+(120-100)*(100-x)≥2580 怎么算,要求完整過程
數(shù)學(xué)人氣：291 ℃時間：2020-02-03 13:52:09
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