{}+{}={}{}—{}={} {}*{}={} 1,2,3,4,5,6,7,8,9,0.

问题描述:

{}+{}={}{}—{}={} {}*{}={} 1,2,3,4,5,6,7,8,9,0.

〖1〗+〖7〗=〖8〗,〖9〗-〖6〗〖3〗,〖4〗x〖5〗=〖20〗