0.8x-0.6x+1.6x=4.81.8x=4.8x=4.8÷1.8x=3分之8
0.8x-0.6x+1.6x=4.8（0.8-0.6+1.6）x=4.8 1.8x=4.8 x=4.8*1.8 x=8/3
