(35-2x)(20-x)=600怎么做
问题描述：
(35-2x)(20-x)=600怎么做
答
(35 - 2x)(20 - x) = 600
2x² - 75x + 700 = 600
2x² - 75x + 100 = 0
x = (75 + 5√193)/4 或 x = (75 - 5√193)/4