maths
a=2-1/1+b
b=?
詳寫
maths
2009-01-30 11:03 pm
回答 (3)
2009-01-30 11:33 pm
✔ 最佳答案
a = 2 - [1/(1 + b)]
Multiply all terms on the both sides by (1 + b):
a(1 + b) = 2(1 + b) - 1
a + ab = 2 + 2b - 1
a + ab = 1 + 2b
ab - 2b = 1 - a
b(a - 2) = 1 - a
b = (1 - a)/(a - 2)
=
2009-01-31 1:44 am
a = 2 - [1 / (1+b)]
a = [2(1+b) - 1] / (1+b)..........右邊通分母
a(1+b) = 2 + 2b - 1
a + ab = 2b + 1
ab - 2b = 1 - a
b(a - 2) = 1 - a
b = (1 - a) / (a - 2)
a = [2(1+b) - 1] / (1+b)..........右邊通分母
a(1+b) = 2 + 2b - 1
a + ab = 2b + 1
ab - 2b = 1 - a
b(a - 2) = 1 - a
b = (1 - a) / (a - 2)
參考: own working
收錄日期: 2021-04-29 18:15:38
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