一月下旬有几天，闰年二月的下旬有几天，四月的下旬有几天？

一月下旬是11天,二月下旬是8天,闰年下旬是9天
甲乙两工程队合修路,甲工效是乙的3/5,合修6天完成2/3,其余乙修,几天才完成.
甲乙合工效是乙工效的1+3/5=8/5倍,而甲乙合做天1天能完工程的（2/3）/6=1/9.所以乙的工效是（1/9）/（8/5）=5/72,乙完成剩下的工程需：（1-2/3）/（5/72）=24/5=4.8天.
家教教的
绝对正确

5-6=-1度 5-9=-4度 预计一月下旬平均气温是-1摄氏度到-4摄氏度.

1Spring festival is the most important festival in China. During Spring festival, people visit their relatives, sending their best wishes for a new year. Children are the happiest in spring festival. They will receive red envelopes that contain money as new year presents. They can also play crackers and fireworks. What's more, they are given a lot of freedom, which they have dreammed of for a whole year. During Spring festival, there will be plenty of foods. That's why many people put on "holiday weight" after Spring festival. When it comes to food,
there are many festival specialties. The world famous Jiaozi and Chunjuan(spring roll) have even been accepted by foreigners as fast foods. Spring festival usually comes in Feburary, sometimes earlier. It's a festival full of hope and good wishes. It's a symbol of Chinese culture.
2The Spring Festival
Spring Festival is the most important festival in China .It’s to celebrate the lunar calendar ‘s new year .In the evening before the Spring Festival ,families get together and have a big meal .In many places people like to set off firecrackers .Dumplings are the most traditional food .Children like the festival very much ,because they can have delicious food and wear new clothes .They can also get some money from their parents. This money is given to children for good luck . People put New Year scrolls on the wall for good fortune .
The Spring Festival lasts about 15 days long .People visit relatives and friends with the words “Have all your wishes ”. People enjoy the Spring Festival ,during this time they can have a good rest .

The Chinese New Year is called the Spring Festival.It's the Chinese new year,it is the last ten days of January or February .The day before new year's day ,people will clean their houses,On the evening of the Chinese new year,family members get together to have a big dinner .And,on the first day of the Spring Festival,people begin to visit their relatives,giving the best wishes for them in the beginning of this new year.That will be the most happiness days for the Chinese.they all like it!

Spring Festival usually comes in the second half of January or the first half of February.