20%(5+x)=4/1x-10.2x5+0.2x=0.25x-11+0.2x=0.25x-10.05x=2x=40满意请采纳,祝学习进步!!
20%(5+x)=4/1x-11/5x5+1/5xX=4X-11+1/5X=4X-12+1/5X=4X X=10/19