计算:3/8+5/9+5/8+4/9=? 62.5×4/5+62.5×20%
问题描述:
计算:3/8+5/9+5/8+4/9=? 62.5×4/5+62.5×20%
答
3/8+5/9+5/8+4/9
=3/8+5/8+(5/9+4/9)
=1+1
=2
62.5×4/5+62.5×20%
=62.5×(0.8+0.2)
=62.5