联立方程N/v+u=N1/V ,N/v-u=N2/v 怎样能解得 N=2N1N2/N1+N2
问题描述:
联立方程N/v+u=N1/V ,N/v-u=N2/v 怎样能解得 N=2N1N2/N1+N2
答
N/v+u=N1/V ,N/v-u=N2/v N2=N-uv N1=N+uv 2N1N2/N1=2N2 N=3N2
N=3N-3uv N=3/2uv