题目

In the past month，we’ve been holding our breath for news about a Boeing 777 plane,MH 370．      It took off from Kuala Lumpur(吉隆坡)，Malaysia．On March 8．It was heading to Beijing．But about two hours into the flight, the plane went missing．      There were 239 people on the flight，including 154 Chinese．      A total of 12 countries including China and the US have joined the search for the plane．      Did it crash? We know that the weather was clear that day．The pilots didn’t make any distress calls(求救信号)．And as of March l3，expert 用简便方法计算。 （1）15.3+0.86+0.14+4.7 （2）147×8+8×53 （3）125×16×5 （4）25.3-8.1-10.9 （5）98×99