已知三元一次方程组13x+5y+9z=18.5,4x+2y+3z=6.2,6x+5y+2z=8的解为x=0.5,y=0.6,z=1,求
2019-05-07
已知三元一次方程组13x+5y+9z=18.5,4x+2y+3z=6.2,6x+5y+2z=8的解为x=0.5,y=0.6,z=1,求
优质解答
13x+5y+9z=18.5················①4x+2y+3z=6.2···················②6x+5y+2z=8····················③①-③得 7x+7z=10.5···············...
13x+5y+9z=18.5················①4x+2y+3z=6.2···················②6x+5y+2z=8····················③①-③得 7x+7z=10.5···············...