题目

Most American students have said goodbye to fancy（高档的）fruits these days．In school canteens across the country，cheaper fruits like apples and oranges have taken their place． “People are afraid to spend now，”said Linda Morrow，who owns a shoe and handbag store．“They don’t know what the future will bring．”During the financial（金融的）crisis（危机），several of the country’s biggest banks have been sold or closed．This has made lots of Americans afraid to buy expensive things． Samira Marino，a restaurant owner in Miami，has found everyone is order 已知的三个内角分别是，所对边分别为，满足。 （1）求的值； （2）若，求的面积。