(100-2x)(50-2x)=3600怎么求?
问题描述:
(100-2x)(50-2x)=3600怎么求?
答
(100-2x)(50-2x)=3600
5000-200x-100x+4x(2)=3600
4x(2)-300x+1400=0
(4x-20)(x-70)=0
x=5 或者 x=70