30*(1&2+2&5-7&15)=

问题描述:

30*(1&2+2&5-7&15)=

如果是除号的话,就是 =30* (1/2+2/5-7/15) =30*1/2+30*2/5-30*7/15 =15+12-14 =13 请采纳回答,