天国的姐弟：姉弟のカンケイ【1-4部】合集中文版【名作/3.3G】

。打排位拿华

曲率k=y''/[(1+(y')^2)^(3/2)]，其中y',y"分别为函数y对x的一阶和二阶导数。
1、设曲线r(t) =(x(t),y(t)),曲率k=(x'y" - x"y')/((x')^2 + (y')^2)^(3/2)量函数,曲率k=|r'×r"|/(|r'|)^(3/2),|x|表示向量x的长度。
3、向量a,b的外积,若a=(a1,a2,a3),b=(b1,b2,b3),a×b=(a2b3-a3b2,a3b1-a1b3,a1b2-a2b1)。

。打排位拿华

答案：k=y''/[(1+(y')^2)^(3/2)]
解析：
曲率k=y''/[(1+(y')^2)^(3/2)]，其中y',y"分别为函数y对x的一阶和二阶导数。
1、设曲线r(t) =(x(t),y(t)),曲率k=(x'y" - x"y')/((x')^2 + (y')^2)^(3/2)。
2、设曲线r(t)为三维向量函数,曲率k=|r'×r"|/(|r'|)^(3/2),|x|表示向量x的长度。
3、向量a,b的外积,若a=(a1,a2,a3),b=(b1,b2,b3),a×b=(a2b3-a3b2,a3b1-a1b3,a1b2-a2b1)。

。打排位拿华

答案：k=y''/[(1+(y')^2)^(3/2)]
解析：
曲率k=y''/[(1+(y')^2)^(3/2)]，其中y',y"分别为函数y对x的一阶和二阶导数。
1、设曲线r(t) =(x(t),y(t)),曲率k=(x'y" - x"y')/((x')^2 + (y')^2)^(3/2)。
2、设曲线r(t)为三维向量函数,曲率k=|r'×r"|/(|r'|)^(3/2),|x|表示向量x的长度。
3、向量a,b的外积,若a=(a1,a2,a3),b=(b1,b2,b3),a×b=(a2b3-a3b2,a3b1-a1b3,a1b2-a2b1)。

。打排位拿

5. Chinese Kung Fu, also known as Wushu, is a  valuable
(文化财富)accumulated
by the Chinese people over many years.
6. We should work hard to
(吸收，汲
取)the philosophical and moral essence of  (中国传统文化).
7. The  Chinese nation  has  extraordinary
capabilities, with which it has built the great  Chinese civilization and with which we can  (扩大;拓展)and stay on the development  path suited to China's national conditions
8. Two things will enable China to
(关
注;聚焦于)development: a harmonious and  stable domestic environment and a peaceful  and stable international environment.
《

。打排位拿

5. Chinese Kung Fu, also known as Wushu, is a  valuable
(文化财富)accumulated
by the Chinese people over many years.
6. We should work hard to
(吸收，汲
取)the philosophical and moral essence of  (中国传统文化).
7. The  Chinese nation  has  extraordinary
capabilities, with which it has built the great  Chinese civilization and with which we can  (扩大;拓展)and stay on the development  path suited to China's national conditions
8. Two things will enable China to
(关
注;聚焦于)development: a harmonious and  stable domestic environment and a peaceful  and stable international environment.
《

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。打排位拿

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。打排位

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。打排位

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