3.25×4.78×4=3.25×4×4.78=13×4.78=62.14
3.25x4x4.78=13x4.78=62.14
3.25X4.78X4=(3.25X4)X4.78=(3X4+0.25X4)X4.78=13X5-13X0.22=65-13X0.2-13X0.02=65-2.6-0.26=65-2.86=65-3+0.14=62.14
简便方法计算看图
