1.12x+5y=4.9
2.6x+2y=2.2
由1得x=(4.9-5y)/12
将1带入2得(4.9-5y)/12*6+2y=2.2
4.9/2-5y/2+2y=2.2
2.45-2.5y+2y=2.2
0.5y=2.45-2.2
y=0.5
将y=0.5带入1,得x=(4.9-2.5)/12
x=0.2
1.12x+5y=4.9
2.6x+2y=2.2
由1得x=(4.9-5y)/12
将1带入2得(4.9-5y)/12*6+2y=2.2
4.9/2-5y/2+2y=2.2
2.45-2.5y+2y=2.2
0.5y=2.45-2.2
y=0.5
将y=0.5带入1,得x=(4.9-2.5)/12
x=0.2