axb=252 bxc=96 cxa=168 求a=( )
附算式和解釋 謝謝!!
2005-07-30 10:18:01 · 4 個解答 · 發問者 Anonymous in 科學 ➔ 數學
註: * 代表“乘”→ 2*3 = 6
^ 代表“次方”→ 2^3 = 2*2*2 = 8
a*b = 252 = 2^2 * 3^2 * 7
b*c = 96 = 2^5 * 3
c*a = 168 = 2^3 * 3 * 7
(a*b*c)^2 = 2^10 * 3^4 * 7^2
a*b*c = 2^5 * 3^2 * 7
(a*b*c)/(a*b) = c = 2^3 = 8
(a*b*c)/(b*c) = a = 3 * 7 = 21
(a*b*c)/(c*a) = b = 2^2 * 3 = 12
2005-07-30 10:32:49 · answer #1 · answered by 軒 2 · 0⤊ 0⤋
題目要打清楚阿...你打axb=252
有些人會誤以為是3數連乘的積
正確的乘號應該是"*"
在數字鍵盤減號旁邊的那個六角形
而他左邊則是除號
2005-08-01 07:52:24 · answer #2 · answered by smallwhite 7 · 0⤊ 0⤋
a × b = 252
b × c = 96
c × a = 168
求 a = ?
解:
a/c = a × b/b × c = 252 / 96
(c × a) ×( a/c) = a 的平方 = 252 × 168/ 96 = 441
a =√441 = 21
2005-07-30 19:36:14 · answer #3 · answered by Big_John-tw 7 · 0⤊ 0⤋
a=252÷b
c×a=168
c×252÷b=168
252÷b=168÷c
b:c=252:168
=3:2
b=2分之3c
b×c=96
代入:b=2分之3c
c平方=64
c=8
b=12
a=21
A:21
(不知道對不對錯了別怪我)
2005-07-30 12:09:33 · answer #4 · answered by Anonymous · 0⤊ 0⤋