求a:b:c
請例出算式！
更新1:
唔好意思，我打錯咗， 問題應該係３a＝５b，３b＝２c
maths~急
回答 (5)
2006-11-09 1:59 am
✔ 最佳答案
3a=5b（d應為b之誤）a=5b/3
3b=2c
c=3b/2
所以，
a:b:c
=5b/3:1:3b/2
=6(5b/3):6(1):6(3b/2)
=10:6:9
參考: Calculation
2006-11-09 2:03 am
did you mean 3a = 5b and 3 b = 2c
i assume it is.....
given 3a=5b & 3b=2c
re-arrange the equations,
3b=2c
=> b = 2/3c
sub b into a
=> 3a=5(2/3c)
=> a=10/9c
sub c into a to find b
b = 2/3(9/10)
b = 3/5
hence, a:b:c = 10/9:2/3:1 in terms of c
therefore, the ratio for a:b:c is equal to
10:6:9
i assume it is.....
given 3a=5b & 3b=2c
re-arrange the equations,
3b=2c
=> b = 2/3c
sub b into a
=> 3a=5(2/3c)
=> a=10/9c
sub c into a to find b
b = 2/3(9/10)
b = 3/5
hence, a:b:c = 10/9:2/3:1 in terms of c
therefore, the ratio for a:b:c is equal to
10:6:9
2006-11-09 1:59 am
3a=5b,3b=2c
3a=5b
3a/b=5
a/b=5/3
a:b=5:3 .....(1)
3b=2c
3b/c=2
b/c=2/3
b:c=2:3......(2)
from (1), a:b=5:3=10:6 ....(3)
from(2),b:c=2:3=6:9.......(4)
combine (3) and(4)
a:b:c=10:6:9
3a=5b
3a/b=5
a/b=5/3
a:b=5:3 .....(1)
3b=2c
3b/c=2
b/c=2/3
b:c=2:3......(2)
from (1), a:b=5:3=10:6 ....(3)
from(2),b:c=2:3=6:9.......(4)
combine (3) and(4)
a:b:c=10:6:9
2006-11-09 1:59 am
設a是5 d是3 b是2 c是3
答案:5:3:2:3
答案:5:3:2:3
收錄日期: 2021-04-23 16:00:11
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