B-A=5.6-5.4=0.2A=(5.4-0.2×2)÷5=1B=1+0.2=1.2
二式减一式得:B-A=5.6-5.4=0.2 (3)二式加一式得:5A+5B=5.4+5.6=11,简化得:A+B=2.2 (4)(3)+(4)=2B=2.4,B=1.2(4)-(3)=2A=2,A=1
解方程组,得,B=1.2,A=1