小四數學題:
A+A+B=48
B+B+A=41
問A的數值是什麼? (請詳細回答)
小四數學題
2009-03-06 12:08 am
回答 (4)
2009-03-06 12:14 am
✔ 最佳答案
A+A+B=48-------(1)B+B+A=41-------(2)
from (1):
we have
2A+B=48
B=48-2A----------(3)
put (3) into (2):
we have
2x(48-2A)+A=41
96-4A+A=41
96-3A=41
3A=96-41
3A=45
A=15
2009-03-07 5:57 am
A+A+B=48---------1
B+B+A=41---------2
從1 A=(48-B)/2-----------3
3代入2 B+B+(48-B)/2=41
B+24=41
B=17
.`.A=(48-17)/2
=15.5
.`.A=15.5,B=17
B+B+A=41---------2
從1 A=(48-B)/2-----------3
3代入2 B+B+(48-B)/2=41
B+24=41
B=17
.`.A=(48-17)/2
=15.5
.`.A=15.5,B=17
2009-03-06 12:17 am
A+A+B=48
B=48-A-A
B+B+A=41
48-A-A+48-A-A+A=41
96-3A=41
96-41=3A
55=3A
A=55/3
B=48-A-A
B+B+A=41
48-A-A+48-A-A+A=41
96-3A=41
96-41=3A
55=3A
A=55/3
2009-03-06 12:17 am
B = 48 - A - A
48-A-A+48-A-A+A = 41
96-3A=41
96-41=3A
A = 55/3
A = 18 1/3 = 18.333
48-A-A+48-A-A+A = 41
96-3A=41
96-41=3A
A = 55/3
A = 18 1/3 = 18.333
收錄日期: 2021-04-13 16:29:35
原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090305000051KK00769