1/2log2(x) - log2(x-1) = 1
C.E: x > 0, x-1> 0; x>1
Log2(x½) - log2(x-1) = 1
Log2(x½/(x-1)) = 1
2¹ = √x / x-1
4 = x/(x² - 2x + 1)
4x² - 8x + 4 = x
4x² - 9x + 4 = 0
x = 9/8 +- (√(81 - 64))/8
x = 9/8 +- √17 / 8. x = (9+√17)/8
@alfish Grazie mille.
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