3x+y-4z=1,2x+y-4z=1,5x+3y-3z=1/2
问题描述:
3x+y-4z=1,2x+y-4z=1,5x+3y-3z=1/2
答
因为3x+y-4z=1,2x+y-4z=1所以3x+y-4z=2x+y-4z3x-2x=y-y-4z+4z x=0因为x=0 且3x+y-4z=1 所以 y-4z=1y=4z+1又因为5x+3y-3z=1/2 所以 3y-3z=1/2(6y-6z)/2=1/2 6y-6z=16(4z+1)-6z=1 24z-6z+6=118z=-5z= -5/18 ...