计算下面各题能简算的要简算 1.3/4×3/5+2/5×3/4= = = = 2.8×5/6+2/5÷4= = = =

问题描述:

计算下面各题能简算的要简算 1.3/4×3/5+2/5×3/4= = = = 2.8×5/6+2/5÷4= = = =