2023-09-01 59 0

已知当yx时(dl) (dx) (dy)为dydxdlsqrt(2)dx。由于图的旋转轴是y = x，所以乘积dl在y = x上，L = √ 2x，由于图的旋转轴是y = x，所以乘积dl在y = x上，L = √ 2x，费马大定理为什么DL/