0.4分之x-0.3减0.2分之x+0.4等于1求解解：(x-0.3)/0.4-(x+0.4)/0.2=1两边同乘以0.4x-0.3-2(x+0.4)=0.4x-0.3-2x-0.8=0.4x=-1.5
