3.14x3.14 68.8x1.314= （简便计算）不好意思应该是3.14x3.14十68.6x1.314_数学解答

3.14x3.14 68.8x1.314= （简便计算）
不好意思应该是3.14x3.14十68.6x1.314

人气：319 ℃　时间：2020-01-28 22:20:35

解答

3.14x3.14十68.6x1.314
=31.4×0.314+68.6×（1+0.314）
=31.4×0.314+68.6×1+68.6×0.314
=0.314×(31.4+68.6)+68.6×1
=0.314×100+68.6
=31.4+68.6
=100