52.44*79.45+159*47.56+79.55*52.44 簡便運算

題目：

52.44*79.45+159*47.56+79.55*52.44 簡便運算

解答：

52.44*79.45+159*47.56+79.55*52.44
=52.44x(79.45+79.55)+159x47.56
=52.44x159+159x47.56
=(52.44+47.56)x159
=100x159
=15900