(0.3-X)(500+3000X)=160 X等于多少?

如题
2025-06-27 14:32:39
推荐回答(1个)
回答1:

(0.3-X)(500+3000X)=160
150+900x-500x-3000x^2=160
3000x^2-400x+10=0
(300x-10)(10x-1)=0
x1=1/30 x2=1/10