2y2=4−7y2y^2=4-7y2y2=4−7y
7xy2+3xy−2x2y7xy^2+3xy-2x^2y7xy2+3xy−2x2y
0.5x−4x+1.5x0.5x-4x+1.5x0.5x−4x+1.5x
e(1−b)−12e\left(1-b\right)^{-\frac{1}{2}}e(1−b)−21
1y′=x2y21+x\frac{1}{y'}=\frac{x^2y^2}{1+x}y′1=1+xx2y2
limx→1(4x−3x−1x−1)\lim_{x\to1}\left(\frac{4^x-3^x-1}{x-1}\right)x→1lim(x−14x−3x−1)
x−7<−4x-7<-4x−7<−4
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