99.99乘0.8加11.11乘2.8简算
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99.99×0.8+11.11×2.8
= (11.11×9)×0.8+11.11×2.8
= 11.11×(9×0.8)+11.11×2.8
= 11.11×7.2+11.11×2.8
= 11.11×(7.2+2.8)
= 11.11×10
= 111.1
= (11.11×9)×0.8+11.11×2.8
= 11.11×(9×0.8)+11.11×2.8
= 11.11×7.2+11.11×2.8
= 11.11×(7.2+2.8)
= 11.11×10
= 111.1
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