4×（2.44-1.8）÷0.4简便计算!
问题描述：
4×（2.44-1.8）÷0.4简便计算!
答
=（4÷0.4）×0.64
=10×0.64
=6.4
4×（2.44-1.8）÷0.4简便计算!
=（4÷0.4）×0.64
=10×0.64
=6.4