（0.4x一0.4）/（6x一1.2一0.2）/0.6=80.4x一0.4=8×（6x一1.2一0.2）/0.60.6×（0.4x一0.4）=8×（6x一1.2一0.2）0.24x一0.24=48x一9.6一1.648x一0.24x=9.6+1.6一0.2447.76x=10.96x≈0.23
