几道英语的数学题what is the inverse of C in the system below?M I C EM E C M II C E I MC I M E CE M I C E (1)M (2)I (3)C (4)EIn the accompanying table determine the inverse of B.# T A B L ET A B E T LA B E L A TB E L T B AL T A B L EE L T A E

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几道英语的数学题what is the inverse of C in the system below?M I C EM E C M II C E I MC I M E CE M I C E (1)M (2)I (3)C (4)EIn the accompanying table determine the inverse of B.# T A B L ET A B E T LA B E L A TB E L T B AL T A B L EE L T A E
几道英语的数学题
what is the inverse of C in the system below?
M I C E
M E C M I
I C E I M
C I M E C
E M I C E
(1)M (2)I (3)C (4)E
In the accompanying table determine the inverse of B.
# T A B L E
T A B E T L
A B E L A T
B E L T B A
L T A B L E
E L T A E B

几道英语的数学题what is the inverse of C in the system below?M I C EM E C M II C E I MC I M E CE M I C E (1)M (2)I (3)C (4)EIn the accompanying table determine the inverse of B.# T A B L ET A B E T LA B E L A TB E L T B AL T A B L EE L T A E
这些是简单的二元运算题.
下面是解题需要的概念:
1.二元运算 (binary operation):设s为集合,函数f:sxs->s 称为s上的二元运算,
即 f{(a,b)}=c 记为 a#b=c,我们用*,#,△,○等符号表示二元运算.
2.幺元 (identity element):设e∈s,e#x=x#e=x,则称e为运算"#"的幺元,若幺元存在必唯一.
3.逆元 (inverse element):设e∈s,且为运算"#"的幺元,若a#b=b#a=e,则a为b的逆元,逆元是针对某个元素 而言的 (可能有些元素有逆元,有些没有).
这两题都是一个类型的题目,你第一题题目可能写错了,因为找不到identity element,
所以我只能告诉你第二题的做法,与第一题解题方法一样.
第二题题目意思:根据下面的表格,找到B的逆元
# T A B L E
T A B E T L
A B E L A T
B E L T B A
L T A B L E
E L T A E B
从图表可以看出:
L#T=T 且 T#L=T
L#A=A 且 A#L=A
L#B=B 且 B#L=B
L#L=L 且 L#L=L
L#E=E 且 E#L=E
所以,L无论与哪个元素结合,顺序如何,结果都与L结合的元素相同
所以,L为集合中的“幺元”.
要找出B的逆元,只需找到与B结合结果为幺元"L"的元素,
从图表可知:B#A=L 且 A#B=L
所以B的逆元为A 即,the inverse of B is A.

我不懂

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