已知x分之2y+2z=y分之2x+2z=z分之2x+2y=k求k的值
问题描述:
已知x分之2y+2z=y分之2x+2z=z分之2x+2y=k求k的值
答
2y+2z/x=2x+2z/y=2x+2y/z=k2y+2z=kx 2x+2z=ky 2x+2y=kz三式相加:4(x+y+z)=k(x+y+z) k =4
已知x分之2y+2z=y分之2x+2z=z分之2x+2y=k求k的值
2y+2z/x=2x+2z/y=2x+2y/z=k2y+2z=kx 2x+2z=ky 2x+2y=kz三式相加:4(x+y+z)=k(x+y+z) k =4