99.99*5.5-55.55*9.9 简算

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99.99*5.5-55.55*9.9简算99.99*5.5-55.55*9.9简算99.99*5.5-55.55*9.9简算99.99×5.5-55.55×9.9=99.99×5.5-11.11×5

99.99*5.5-55.55*9.9 简算
99.99*5.5-55.55*9.9 简算

99.99*5.5-55.55*9.9 简算
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