8ab−1+3b+14−2ab8ab-1+3b+14-2ab8ab−1+3b+14−2ab
ddx1x−1y=0\frac{d}{dx}\frac{1}{x}-\frac{1}{y}=0dxdx1−y1=0
(2a+2b+2c)2\left(2a+2b+2c\right)^2(2a+2b+2c)2
−7+2+2+x-7+2+2+x−7+2+2+x
6x2+54x<06x^2+54x<06x2+54x<0
(x+x2−12)+(x−x2−12)\left(\frac{\sqrt{x+\sqrt{x^2-1}}}{2}\right)+\left(\frac{\sqrt{x-\sqrt{x^2-1}}}{2}\right)(2x+x2−1)+(2x−x2−1)
dsdt=s+t\frac{ds}{dt}=s+tdtds=s+t
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