因为3x+2y=5.4 2x+3y=5.6
所以(3x+2y)-(2x+3y)=5.4-5.6
x-y=-0.2
x+0.2=y
3x+2(x+0.2)=5.4
3x+2x+0.4=5.4
5x+0.4=5.4
5x=5.4-0.4
5x=5
x=1
因为x+0.2=y
所以y=1+0.2
y=1.2