(-1)+(-1/2)+3/4+(-1/4)解 特别详细的,每一步都要写出来.
问题描述:
(-1)+(-1/2)+3/4+(-1/4)解 特别详细的,每一步都要写出来.
答
(-1)+(-1/2)+3/4+(-1/4)
=-1-1/2+(3/4-1/4
=-1-1/2+1/2
=-1能不能一步步地算,从第一个加算起,(-1)+(-1/2)+3/4+(-1/4)=-1又1/2+3/4-1/4=-3/4-1/4=-1(-1)+(-1/2)+3/4+(-1/4)=-(1/2)+3/4+(-1/4)=-(1/4)+ -(1/4) 哪错了啊?第一步错了,是-1又1/2