[計量] 陳向東數學題目問題
請問各位
我在陳向東的數學內有遇到1個問題不太懂
P79 31題
x t u
_________________
t a b
________________
u b c
If y is a two-digit number with ten digit t and unit digit u and the
table above is a multiplication table for t and u (for example, t *u =b),
then y^2=
(A) a+2b+10c
(B) 10a+20b+c
(C) 10(a+2b+c)
(D) 100(a+2b+c)
(E) 100a+20b+c
這題我主要是看不太懂他的乘法表要如何理解?
好像是對角線相乘=右下角那個?
以前沒看過這種乘法表，題目也沒有說得很詳細這個乘法表要怎麼看
謝謝
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 182.235.173.205
推
02/16 12:59, , 1F
02/16 12:59, 1F
→
02/16 13:01, , 2F
02/16 13:01, 2F
→
02/16 13:02, , 3F
02/16 13:02, 3F
→
02/16 13:20, , 4F
02/16 13:20, 4F
推
02/16 13:36, , 5F
02/16 13:36, 5F
→
02/16 13:37, , 6F
02/16 13:37, 6F
→
02/16 13:57, , 7F
02/16 13:57, 7F
→
02/16 13:58, , 8F
02/16 13:58, 8F
→
02/16 13:59, , 9F
02/16 13:59, 9F
→
02/16 14:00, , 10F
02/16 14:00, 10F
→
02/16 15:03, , 11F
02/16 15:03, 11F