3.14的平方加68.6乘1.314 简便计算

分类: 作业答案 • 2021-12-19 15:52:40

问题描述：

答

.14^2+68.6*1.314
=3.14^2+68.6*(1+0.314)
=3.14^2+68.6+68.6*0.314
=3.14^2+68.6+6.86*3.14
=3.14*(3.14+6.86)+68.6
=3.14*10+68.6
=31.4+68.6
=100

答

3.14²+68.6×1.314
=3.14²+68.6×(1+0.314)
=3.14²+68.6×1+68.6×0.314
=68.6+3.14²+6.86×3.14
=68.6+3.14×(3.14+6.86)
=68.6+3.14×10
=68.6+31.4
=100