解三元一次方程组:{x+y+z=68,x/5+y/4+z/6=13,5/x+y/6+z/4=15.
问题描述:
解三元一次方程组:{x+y+z=68,x/5+y/4+z/6=13,5/x+y/6+z/4=15.
答
x+y+z=68.(1)x/5+y/4+z/6=13.(2)x/5+y/6+z/4=15.(3)(2):12x+15y+10z=780.(4)(3):12x+10y+15z=900.(5)(5)-(4):-5y+5z=120-y+z=24.(6)(5)-(1)*12:10y-12y+15z-12z=900-816-2y+3z=84.(7)(7)-(6)*2:3z-2z=84-48z=36...