初二数学题几道，多为填空，只要答案无需过程，各位大虾帮帮忙求速解阿！！~
Christmas Day falls on the twenty-fifth of December. It is a very happy day for many boys and girls . Before the term ends in some schools , the children act a nativity① or “birth” play, showing how Jesus② was born in a stable③.
On the twenty-fourth of December, all children are very excited. Usually they are sent to bed early so that their parents can get the presents ready. The younger children think that Father Christmas will come down the chimney or fireplace , so they hang up a sock for him to put presents in. The greedy ones even hang up a pillow-case④ or a sack⑤ to try to get more presents. Later that night, Father or Mother will put presents in the sock, and leave others at the side of the bed.
On Christmas morning, the children wake up very early. Some even turn on the light at two o'clock, and most of them are awake by six o'clock although it is not light in England for another hour or two at this time of the year.Children look for their presents , and the young ones play while the dinner is prepared. At about one o'clock in the afternoon, the Christmas dinner is brought in . The turkey or chicken is quickly eaten . Children search in their Christmas pudding for new coins which are hidden in it . The rest of the day is full of games and eating until the happiest of all Christmas hollidays comes to an end.
到会人数为n人，那么，每人握手(n-1)次
故，n(n-1)/2=66
n(n-1)=132
n=12
所以，这次参加会议的有12人。
2 、 √2-√3
3、 5a² 5a²(2bc-1)
4、 3/2
5、 x=4, y=√6 -2, x-1的算数平方根=√3
6、 ±1/3
7、 9
8、 大约发出了42次嘀嗒声
同情楼主，打字累死我了~
1. 1+根号2
打上去 太麻烦了
2: √2-√3
4：x=4 y=2+√6-4
=√6-2
x-1的算数平方根 √3
7：解：a=5 b=2
a+2b=5+2×2
=9
8：当L=0.5m，g=9.8 m/s²时
T=2∏√L/g
=2∏√0.5/9.8
约等于 1.42
60/T =60/1.42 约等于 42次
1.1+根号2
2.看不懂∏是什么意思
3.-5a² , -5a²(1-2bc)
4.a³b+2a²b²+ab³=ab(a+b)²
将a+b=2，ab=3/8代入a³b+2a²b²+ab³得3/2.
5.x=4,y=(根号6)-2,x-1的算数平方根=根号3
7.
初二数学题几道，多为填空，只要答案无需过程，各位大虾帮帮忙求速解阿！！~视频
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