24×2/5+75÷2.5+0.4 简算简算!
问题描述:
24×2/5+75÷2.5+0.4 简算简算!
答
24×2/5+75÷2.5+0.4
=24×2/5+75÷5/2+2/5
=24×2/5+75×2/5+2/5
=(24+75+1)×2/5
=100×2/5
=40