0.25×8.4用简便方法计算,

问题描述:

0.25×8.4用简便方法计算,

0.25×8.4
=0.25x4x21.
=1x2.1
=2.14.63×4×0.5用简便方法计算,怎么做4.63×4×0.5=4.63x2x(2x0.5)=9.26x1=9.26