7.23+6.84+0.84+2.77简便
问题描述:
7.23+6.84+0.84+2.77简便
答
7.23+6.84+0.84+2.77=(7.23+2.77)+(6.84+0.84)=10+7.68=17.68
我怀疑原题是-0.84
答
7.23+6.84+0.84+2.77
=(7.23+2.77)+6+(0.84+0.84)
=10+6+0.84*2
=16+1.68
=17.68