一点三二乘九点九加零点一三等于多少用简便计算

Question

如题所述

Answer 1

1.32×9.9+0.13
=1.32×（10-0.1）+0.13
=1.32×10-0.132+0.13
=13.2-（0.132-0.13）
=13.2-0.002
=13.198