120u/(v-u)+120u/(v+u)=288
120u[1/(v-u)+1/(v+u)]=288
5u[1/(v-u)+1/(v+u)]=12
5u{2v/[(v-u)(v+u)]}=12
10uv/[(v-u)(v+u)]=12
10uv=12[(v-u)(v+u)]
5uv=6[(v-u)(v+u)]
5uv=6(v²-u²)
6v²-5uv-6V²=0
(2u-3v)*(3u+2v)=0
u=3v/2 u=-2v/3(舍去)
120u/(v-u)+120u/(v+u)=288
120u[1/(v-u)+1/(v+u)]=288
5u[1/(v-u)+1/(v+u)]=12
5u{2v/[(v-u)(v+u)]}=12
10uv/[(v-u)(v+u)]=12
10uv=12[(v-u)(v+u)]
5uv=6[(v-u)(v+u)]
5uv=6(v²-u²)
6v²-5uv-6V²=0
(2u-3v)*(3u+2v)=0
u=3v/2 u=-2v/3(舍去)