1.725+2.725+3.725+.80.725=
问题描述:
1.725+2.725+3.725+.80.725=
答
=
1+2+..+80+0.725*80
=3298
1.725+2.725+3.725+.80.725=
=
1+2+..+80+0.725*80
=3298