S2 Maths

👨🏻‍🏫 學術台數學

2011-10-28 4:00 am

Please to slove the following questions:

[Solve the following exponential equation]

1. 2^x+2 + (3)(2^x) = 56

2. 3^x+1 + (1)(7^x+1) = 9201

3. 3^x+1 - 3^x-1 - 72 = 0

回答 (1)

2011-10-28 6:00 am

✔ 最佳答案

1.
圖片參考：http://mathway.com/math_image.aspx?p=2SMB02ESMB03x+2SMB02eSMB03+3*(2SMB02ESMB03xSMB02eSMB03)SMB0156?p=134?p=22

圖片參考：http://mathway.com/math_image.aspx?p=2SMB02ESMB032SMB02eSMB03*2SMB02ESMB03xSMB02eSMB03+3*(2SMB02ESMB03xSMB02eSMB03)SMB0156?p=147?p=22

圖片參考：http://mathway.com/math_image.aspx?p=7*(2SMB02ESMB03xSMB02eSMB03)SMB0156?p=92?p=22

圖片參考：http://mathway.com/math_image.aspx?p=(2SMB02ESMB03xSMB02eSMB03)SMB018?p=61?p=22

x=3

2. 你係唔係咁嘅意思?
圖片參考：http://mathway.com/math_image.aspx?p=3SMB02ESMB03x+1SMB02eSMB03+(1)(7SMB02ESMB03x+1SMB02eSMB03)SMB019201?p=178?p=22

3.
圖片參考：http://mathway.com/math_image.aspx?p=3SMB02ESMB03x+1SMB02eSMB03-3SMB02ESMB03x-1SMB02eSMB03-72SMB010?p=127?p=22

圖片參考：http://mathway.com/math_image.aspx?p=3*3SMB02ESMB03xSMB02eSMB03-SMB02FSMB031SMB103SMB02fSMB03(3SMB02ESMB03xSMB02eSMB03)SMB0172?p=128?p=42

圖片參考：http://mathway.com/math_image.aspx?p=SMB02FSMB038SMB103SMB02fSMB03(3SMB02ESMB03xSMB02eSMB03)SMB0172?p=83?p=42

圖片參考：http://mathway.com/math_image.aspx?p=3SMB02ESMB03xSMB02eSMB03SMB0127?p=56?p=22

x=3

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