(30-x)(解50-x)=503075%怎么解RT

分类: 作业答案 • 2021-12-20 05:42:58

问题描述：

(30-x)(解50-x)=50*30*75%怎么解
RT

答

(30-x)(50-x)=50*30*75%
(x-30)(x-50)=1125
x²-80x+375=0
(x-5)(x-75)=0
x-5=0或者x-75=0
x=5或者x=75

答

(30-x)(50-x)=50*30*75%
1500-80x+x^2=1125
x^2-80x+375=0
(x-5)(x-75)=0
x=5 or x=75

(30-x)(解50-x)=50*30*75%怎么解RT