求微积分方程通解x﹙y²-1﹚dx+y﹙x²-1﹚dy=0
问题描述:
求微积分方程通解x﹙y²-1﹚dx+y﹙x²-1﹚dy=0
答
采用凑微分法x﹙y²-1﹚dx+y﹙x²-1﹚dy=(xy²dx+yx²dy) -xdx -ydy=d(1/2x²y²)-d(1/2x²)-d(1/2y²)=1/2d(x²y²-x²-y²)=0,所以x²y²-x²-...