Monotone decreasing interval of function y = 8x ^ 2-lnx

Let's take the derivative first, and we'll get y '= 16x-1 / x, and then we'll find y'directly

The increasing interval, / decreasing interval / maximum / / / / / of function y = LNX / X should have a process

The key to solve the problem is: the sign of the first derivative of a function determines its increase or decrease, so the derivation is the key
y=lnx/x
y'=(1/x*x-lnx*1)/x^2
=(1-lnx)/x^2
When y '> 0, 0

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