數學問題f,1

2006-10-28 11:37 pm
2         1           1
- (3b=2)- - (3b-1)= -1-
3         6           2

回答 (2)

2006-10-28 11:45 pm
✔ 最佳答案
Multiply the whole equation by 6.
4(3b - 2) - (3b - 1) = -9
12b - 8 - 3b + 1 + 9 = 0
9b = -2
b = -2/9

2006-10-31 19:32:08 補充:
哪有計錯數?
參考: CE MATHS Syllabus
2006-10-30 8:29 am
2/3 (3b - 2) - 1/6 (3b - 1) = -3/2
4 (3b - 2) - (3b - 1) = -9
12b - 8 - 3b + 1 = -9
9b = -9 + 7
9b = -2
b = -2 / 9


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