99.99*5.5-55.55*9.9 简算
问题描述:
99.99*5.5-55.55*9.9 简算
答
99.99×5.5-55.55×9.9 =99.99×5.5-11.11×5×1.1×9 =99.99×5.5-﹙11.11×9﹚×﹙1.1×5﹚ =99.99×5.5-99.99×5.5 =99.99×﹙5.5-5.5﹚ =99.99×0 =0