0.78×5-19/50+4×19/50 怎样简便计算
问题描述:
0.78×5-19/50+4×19/50 怎样简便计算
答
0.78×5-19/50+4×19/50
=0.78×5+19/50×(4-1)
=3.9+0.38×3
=3.9+1.14
=5.04