13.9-3.51+6.1+2.51简便计算
问题描述:
13.9-3.51+6.1+2.51简便计算
答
=(13.9+6.1)+(2.51-3.51)=20-1=19
答
13.9-3.51+6.1+2.51
=(13.9+6.1)-(3.51-2.51)
=20-1
=19
答
13.9+6.1+2.51-3.51
=20+2.51-3.51
=22.51-3.51
=19
答
原式=(13.9+6.1)-(3.51-2.51)
=20-1
=19