質問: x+y+z=1 2x+4y+6z=2 -x+3y-5z=11
回答: i will not solve this system for you, but i will tell you how to do so.divide the 2nd equation by 2.then add the 3rd equation to each of the other 2.this will eliminate the x variable and leave you with 2 simultaneous equations in y and z.in one of the 2 resulting equations the coefficient of the z variable is -4 and the other coefficient of z is -2.multiply by two and subtract the 2 equations,this will eliminate the z variable and leave you with a linear equation in y.solve for y and then backtrack to get z and z.