2022-01-06 11:50发布
上外外语学院研究生哪个校区上课？
上外外语学院研究生哪个校区上课？ ^^^dx/dy+(y^4-3x^2)/xy=0dx/dy+y^自3/x-3x/y=0设x/y=u,则x=yuu+y/dy+y^2/u-3u=0/dy+y/u-2u/y=0设u/y=t,则u=ytt+ydt/dy+1/t-2t=0dy/y=dt/(t-1/t)C1+lny=ln(t^2-1)^1/2C2y^2=y^2-1将t，u代入得Cy^6=x^2-y^4 (C1C2C是积分常数)dx/dy+2(x^2-xy^2)/y^3=0dx/dy+2x^2/y^3-2x/y=0设x/y=u则x=yuu+y/dy+2u^2/dy-u/y=0设u/y=t则u=ytt+ydt/dy+2t^2-t=0dt/dy+2t^2/y=0-dt/2t^2=dy/y1/2t=lnY+C1 (Y为y的绝对值，C1为积分常数)把u,t代入得y^2/2x=lnY+C1
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上外外语学院研究生哪个校区上课？ ^^^dx/dy+(y^4-3x^2)/xy=0dx/dy+y^自3/x-3x/y=0设x/y=u,则x=yuu+y/dy+y^2/u-3u=0/dy+y/u-2u/y=0设u/y=t,则u=ytt+ydt/dy+1/t-2t=0dy/y=dt/(t-1/t)C1+lny=ln(t^2-1)^1/2C2y^2=y^2-1将t，u代入得Cy^6=x^2-y^4 (C1C2C是积分常数)dx/dy+2(x^2-xy^2)/y^3=0dx/dy+2x^2/y^3-2x/y=0设x/y=u则x=yuu+y/dy+2u^2/dy-u/y=0设u/y=t则u=ytt+ydt/dy+2t^2-t=0dt/dy+2t^2/y=0-dt/2t^2=dy/y1/2t=lnY+C1 (Y为y的绝对值，C1为积分常数)把u,t代入得y^2/2x=lnY+C1
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