Question

已知△ABC中,角A,B,C所对的边分别为a,b,c。若a+b=2 C=60° 且sinA

已知△ABC中,角A,B,C所对的边分别为a,b,c。若a+b=2 C=60° 且sinA,sinB,sinC 成等比数列,则△ABC的面积为多少？
题目打错！！不好意思。。。
是sinA,sinC,sinB成等比数列。。

Answer 1

边长等于度数？错了吧 用余弦定理加上b的平方＝ac 两条式就可以了。

Answer 2

?? In 2006, Suning to 1.5 days to open a shop rate of the national shop. Yesterday (December 13, 2006), Zhang Jindong, chairman of Suning Appliance, told reporters that next year,Ceramic Hair Straightener Ghd, Suning to open 200 stores in maintaining the annual basis, will also focus on increasing the number of shop in Beijing and Shanghai. Mainly self-built shops to open 200 next year "Gome to buy Paradise 5200000000 shop, indicating that the number of Gome stores or too small, not hesitate to pay big bucks to buy." Yesterday, in the Sofitel Galaxy Nanjing, private clubs, chairman of Suning Appliance Group Zhang Jindong, told a press interview YORK Chinabyte frankly, for the home appliance chain, there is no shop can not talk about other aspects of the scale capacity. "2006 year to 1.5 days Suning to open a shop rate of the national shop. Suning will maintain an annual rate of 200 shop, to open a 1,200 stores by 2010." Zhang Jindong, frankly, the country the number of U.S. stores after the acquisition of Yongle reached 800, but currently only 450 Suning stores in China, but will not blindly Suning and shop. Years to open 200 stores around the number, this number earlier in the six years Suning worked out, and does not change with competitors. "Peers, competitors, the situation is at best shop reference, ultimately, market capacity and economic needs, their own development decisions." "Su Ning accounts, considered to form self-built shop the most cost-effective shop." Zhang Jindong, frankly, so has the advantage of low operating costs. He said the plan is self Suning shop,Pink Hair Straighteners, purchase and rental stores in three ways. After looking down, found that it takes time to buy, lease relatively high prices, so in the future will be self-built shops as a top priority. "When the shop will put the value and effectiveness of the first consideration",CHI Hair Dryer, will also consider increasing the proportion of rental shops. , However, does not exclude Zhang Jindong, this way, through mergers and the purchase of speed shop. But he said it did not encounter the right. "Mainly have accounts, not worth the cost-effective." Suning Beijing and Shanghai into the shop next year, major cities Said Zhang Jindong, shop only time and speed. Suning next year to both hands, shop and management go hand in hand. Indigestion shop to drop off. Optimized background building, to lead peers. "Su Ning in Beijing, Shanghai and the number of stores still relatively low, Suning up shop in a market still has room for." Admitted Zhang Jindong, Suning next year will increase up shop in Beijing and Shanghai number. He explained that the proportion of Suning Beijing, is the fastest sales growth, sales are maintaining a good growth year. But Beijing as the capital of great significance, so Suning additional troops to guard. Headquarters in Shanghai, China Paradise,T3 Hair Straightener, Suning chain advantage is not exposed, so they will shop through the many to change that. Experts believe that a number of market store chain giant offensive has more than 23 markets Appliance expert Lu Renbo that the whole domestic market, 12 the number of home appliance chain stores too much. "As of the end of October this year, the capital goods market Suning, Gome and Dazhong Electronics chain of three stores bringing the total close to 140 surface, especially along the North Third Ring Road, less than 15-kilometer stretch of home appliance chain store close to 30, average 500 meters there is a shop. Beijing home appliance chain stores in general is clearly excessive. "However,Chi Hair Products, said Lu Renbo, Suning, Gome shop in these areas will accelerate the low efficiency, poor corporate earnings out to 12 more markets and more there competition among home appliance chain oligopoly. He also believes that the current market demand for China's 23 large home appliance chain dig into these markets will be able to get more barrels of gold. [Key words]: Suning ?? States United States ?? Yongle Comment Large ?? In ?? Small

Answer 3

完了，这个真不记得了

追问

我题目打错了 不好意思
你再看看这个题目。。
已知△ABC中,角A,B,C所对的边分别为a,b,c。若a+b=2 C=60° 且sinA,sinC,sinB 成等比数列,则△ABC的面积为多少？