Question

12.4-4.8×27.4×99怎么简算？

Answer 1

12.4一4.8x27.4x99
＝12.4一4.8x27.4x（l00一1）
＝12.4一4.8x（2740一27.4）
＝12.4一4.8x2712.6
＝12.4一（5一0.2）x2712.6
＝12.4一5x2712.6十0.2x2712.6
＝12.4一1356.3十542.52
＝554.92一1356.3
＝一801.38

Answer 2

计算如下：
12.4-4.8×27.4×99
=12.4-131.52×99
=12.4-131.52×(100-1)
=12.4-131.52×100-131.52
=12.4-13152+131.52
=12.4-13020.48
=-13008.08