邮政编码中个数字分别代表什么意义？
计算，能简算的要简算．
2.144÷3.2+4.329.66÷2.3÷0.35.5×0.25×1.4
1.25×2.47×827×10.24.8×3.8+6.2×4.8
怎样简便就怎样算．
4.27÷0.7×1.318.9﹣18.9÷1.4 0.25×408
0.25×1.25×160.4×99+0.412.5×1.7+8.3×12.5．
简便计算
12.8﹣0.5×0.5﹣0.75
1.25×3.2×0.8
8.37×1.4+8.6×8.37．
下面的题能用简便方法计算的要用简便方法计算
12.5×8.8÷11．
脱式计算：
0.75×18÷0.157.28+3.2÷2.52.05÷0.82+33.6
1.08×0.8÷0.2721.36÷0.8﹣12.94.28÷0.9÷4.1．