(20+x-16)(100-8x)=504 怎么解呢,要过程,谢谢

问题描述:

(20+x-16)(100-8x)=504 怎么解呢,要过程,谢谢

(20+x-16)(100-8x)=504
(4+x)(100-8x)=504
400-32x+100x-8x²=504
2x²-17x+26=0
(2x-13)(x-2)=0
2x-13=0,x-2=0
x1=13/2.x2=2