用简便方法计算468/[(47-34)*9]7*(78-50)

Question

用简便方法计算
 468/[(47-34)*9]  
  7*(78-50)

Answer 1

468/[(47-34)×9]
=468/(13×9)
=468÷9÷13
=52÷13
=4
7×(78-50)
=7×28
=196