9.9×9.9+0.99 简便计算
问题描述:
9.9×9.9+0.99 简便计算
答
9.9×9.9+0.99 =9.9×9.9+9.9×0.1 =9.9×(9.9+0.1) =9.9×10 =99
9.9×9.9+0.99 简便计算
9.9×9.9+0.99 =9.9×9.9+9.9×0.1 =9.9×(9.9+0.1) =9.9×10 =99