UC知道英文的数学问题
来源：百度知道 编辑：UC知道 时间：2024/06/14 12:34:38
解题过程和答案都要（中文就行）最主要的是解题过程，说清楚过程就好，翻译无所谓，最好也有的，谢谢了
21. You have a cube whose faces you are going to paint blue. In how many distinguishably different ways can you paint the faces? A single painted face, for example, is a single distinguishably different pattern from two adjacent painted faces, but not from any other single painted face.
36. In a student council election, there are 2 candidates for president: Ali and Beth. There are 3 candidates for treasurer: Franco, Gino, and Helen. One possible set of winners is Beth, Devo, and Helen. How many others are there?
37. Ise six 9s and the order of operations to write an expression that equals 100.
39. The table shows the maximum speeds of some animals.
Animal Maximum Speed (km/h)
Ostrich 80
Coyote 72
Elephant 40
Porcupine 18
How many minutes less than a porcupine does a coyote take to run 1 km? What assumptions have you made?
41. A ball is th
21. You have a cube whose faces you are going to paint blue. In how many distinguishably different ways can you paint the faces? A single painted face, for example, is a single distinguishably different pattern from two adjacent painted faces, but not from any other single painted face.
36. In a student council election, there are 2 candidates for president: Ali and Beth. There are 3 candidates for treasurer: Franco, Gino, and Helen. One possible set of winners is Beth, Devo, and Helen. How many others are there?
37. Ise six 9s and the order of operations to write an expression that equals 100.
39. The table shows the maximum speeds of some animals.
Animal Maximum Speed (km/h)
Ostrich 80
Coyote 72
Elephant 40
Porcupine 18
How many minutes less than a porcupine does a coyote take to run 1 km? What assumptions have you made?
41. A ball is th
上面是拿电脑翻译的吧，好雷啊~不过大概就是那个意思，我就直接写答案吧~
21.
分析：因为题目中讲明，涂其中任何一个面都算一种情况，所以是组合不是排列
图一个面——1种情况
图两个面——2种情况（相邻或相对）
图三个面——2种情况（3面都相互相邻，其中2面相互相邻）
图四个面——2种情况（其中2面相互相邻，其中3面相互相邻）
图五个面——1种情况
图六个面——1种情况
所以一共1+2+2+2+1+1=9种情况
36.
题目中说获胜的情况中，一共有3个人，也就是说一共有3个职位参与竞选，而题目却只说了2个职位，所以说还有一个。
37.
9*9+9+9/9+9
=81+9+1+9
=100
39.
Porcupine：1/18=0.056
Coyote: 1/72=0.014
t1-t2
=0.056-0.014
=0.042h
=2.5min
41.
分析：根据已知公式h=20t-5t^2分别将时间1s、2s、3s带入
h1=20*1-5*1^2
=20-5
=15m
h2=20*2-5*2^2
=40-20
=20m
h3=20*3-5*3^2
=60-45
=15m
42.
分析：要求2个数字之和是完全平方数，那么大于2小于26的完全平方数有4、9、16、25共4个。
4——1+3/2+2——2种情况
9——1+8/2+7/3+6/4+5——4种情况
16——3+13/4+12……7+9/8+8——6种情况
25——12+13——1种情况
所以一共有2+4+6+1=13种情况
43.
分析：将20个牙签分成3组，每组都是偶数
2，2，16
2，4，14
2，6，12
2，8，10
4，4，12