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1.子式:在A中,选取k行与k列,位于交叉处的k2个数按照原来的相对位置构成k阶行列式,称为A的一个k阶子式,记作Dk对于给定的k,不同的k阶子式总共有C个 2.矩阵的秩:在A中,若 (1)有某个r阶子式D≠0; (2)所有的r+1阶子式D+1=0(如果有r+1阶子式的话) 称A的秩为r,记作 rankA=r,或者r(A)=r.规定: rankO=0性质:(1) rankA min{m,n}
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概率论与数理统计模拟试题(1) 填空题 1.已知事件AB满足P(AB)=P(AB),且P(A)=P,则B)=() 2.设P(A=04,P(A∪B)=0.7,则(1)若A、B互不相容时,P(B)=() (2)若A、B相互独立时,P(B)=() 3.在1中随机取两个数,则事件“两数之和小于65的概率为()
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Endowments and Allocations Consider first the case of a pure exchange economy. (One with no production). Suppose there are two consumers, A and B, in a two good economy. A starts with an endowment of ωA =
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作业 22 设 , ,a a 1a =1 2 a =1 2 1 2 3 n n n a + = + + ≥1
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一、选择题 (1)C) (2)A) (3)B) (4)B) (5)A) (6)D) (7)B) (8)C) (9)D) (10)C) (11)D) (12)A) (13)B) (14)C) (15)B) (16)D) (17)C) (18)A) (19)C) (20)A)
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1、书写标识符时,忽略了大小写字母的区别。 编译程序把a和A认为是两个不同的变量名,而显示出错信息。C认为大写字母和小写字母是两个不同的字符。习惯上,符号常量名用大写,变量名用小写表示,以增加可读性 。 2、忽略了变量的类型,进行了不合法的运算。 printf(\%d\, a%b) 是求余运算,得到a/b的整余数。整型变量a和b可以进行求余运算,而实型变量则不允许进行「求 余」运算 。 3、将字符常量与字符串常量混淆。 在这里就混淆了字符常量与字符串常量,字符常量是由一对单引号括起来的单个字符,字符串常量是一对 双引号括起来的字符序列
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一.(本题20分)设K为数域.给定K4的两个子空间 M={(x1,2,3,4)|21-x2+4x3-3x4=0,x1+x3-x4=0 N={1,x2,x3,4)3x1+x2+x3=0,7x1+7x3-3x4=0} 求子空间MN和M+N的维数和一组基 二(本题10分)在K4内给定 a1=(1,-1,1,1),a2=(2,-2,0,1). 令M=L(a1,a2).试求商空间K4/M的维数和一组基 三.(本题20分)给定数域K上的3阶方阵 1-11 A=24-2 3-35 1.求K上的3阶可逆方阵T,使T-1AT为对角矩阵 2.对于任意正整数m,求Am
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Introduction 1-2 Definition of a Fluid Fluid mechanics: the behavior of The solid object will no change fluids at rest and in motion inside the a closed container A fluid is a substance that deforms continuously under the application The liquid will change its shape of a shear(tangential) stress no to conform to that of the matter how small the shear stress container and will take on the may be
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Make the best choice: 1.She was able to cope----- the difficulties she met with. a. in b. with. of.to 2. Would you mind ---- the radio? a. not turn on b. not to turn on. not turning on d. not turned on 3.The lion is a ---- of courage. a. symbol b. sign c. mark d. animal
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Part I Reading(40%) Passage 1 Malcolm Greenway is thirty-five years old, married with two children. He lives in a town about twenty kilometers away from the school in which he teaches, and goes to work every morning by car. The village school was built about forty years ago by the local education authority for only about sixty. a new room has recently been added to be used as a dining room, and the playground has been enlarged and improved. A woman teacher is in charge of the youngest children
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