(10+x)(500-20x)=6000
问题描述:
(10+x)(500-20x)=6000
答
5000+500X-200X-20X ^2=6000 -20X ^2+300X-1000=0 20X ^2-300X+1000=0 2X ^2-30X+100=0
(10+x)(500-20x)=6000
5000+500X-200X-20X ^2=6000 -20X ^2+300X-1000=0 20X ^2-300X+1000=0 2X ^2-30X+100=0