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Answers for “如何积分 e^y dy = e^{2x} dx?”

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First, apply the quotient rule for exponents with the same base to rewrite e2x−ye^{2x-y} as e2x/eye^{2x}/e^y. Replace y' with dy/dxdy/dx to get dy/dx=e2x/eydy/dx = e^{2x}/e^y.

Conditions: The equation is a first-order differential equation.; The exponent rule am/an=am−na^m/a^n = a^{m-n} is applicable.

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To set up the integral for the area moment of inertia about the y-axis (IyI_y) using a vertical strip, express the differential area dAdA as the product of the strip's height (upper boundary minus lower boundary) and its width dxdx. Substitute this into the definition Iy=∫x2dAI_y = \int x^2 dA and determine the integration limits based on the horizontal extent of the region bounded by functions of xx.

Conditions: The region is bounded by curves that can be expressed as functions of xx.; A vertical differential strip is chosen, meaning its width is dxdx.; The integration variable is xx.