超簡單指數函數(急)!!!要求詳解超簡單指數函數(急)!!!要求詳解
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超簡單指數函數(急)!!!要求詳解
2011-05-02 12:03 am
回答 (1)
2011-05-02 12:57 am
✔ 最佳答案
4^x - 4^y = 48(4^x - 4^y)(4^y) = 48(4^y)4^(x+y) - (4^y)² = 48(4^y)(2²)^(x+y) - (4^y)² = 48(4^y)[2^(x+y)]² - (4^y)² = 48(4^y)32² - (4^y)² = 48(4^y)(4^y)² + 48(4^y) - 1024 = 0(4^y - 16) (4^y + 64) = 04^y = 16 或 4^y = - 64 (捨)y = 2又 2^(x+y) = 32 = 2^5x + y = 5
x = 5 - y = 5 - 2 = 33x - 4y = 3(3) - 4(2) = 1
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