简便计算7.9×2.1+7.9×7.8+0.79
问题描述:
简便计算7.9×2.1+7.9×7.8+0.79
答
7.9×2.1+7.9×7.8+0.79 =7.9(2.1+7.8+0.1) =7.9x10 =79
简便计算7.9×2.1+7.9×7.8+0.79
7.9×2.1+7.9×7.8+0.79 =7.9(2.1+7.8+0.1) =7.9x10 =79