0.6X:(0.4X+12)=1:2 0.6x*2=(0.4x+12)*1 (内项积=外项积) 1.2x=0.4x+12 0.8x=12 x=15
0.6X:(0.4X+12)=1:2 解:1.2x=0.4x+120.8x=12x=15