4x2−25y22x−5y\frac{4x^2-25y^2}{2x-5y}2x−5y4x2−25y2
ddx1−4x\frac{d}{dx}\sqrt{1-4x}dxd1−4x
(2x3−x2−8x+4)(−x+2)\left(2x^3-x^2-8x+4\right)\left(-x+2\right)(2x3−x2−8x+4)(−x+2)
84⋅984\cdot984⋅9
1−8x2y′=x\sqrt{1-8x^2}y'=x1−8x2y′=x
−4x2+2x−4-4x^2+2x-4−4x2+2x−4
(3n + 2)2 − (3n − 2)2\left(3n\:+\:2\right)^2\:-\:\left(3n\:-\:2\right)^2(3n+2)2−(3n−2)2
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