稍有不同:
设大,中,小分别为X,Y,Z;
∵Y=2Z-0.20;
X=Y+Z+0.40;
9.60=X+Y+Z;
∴Z=9.60-(X+Y);
∴X=Y+Z+0.40;
Y=2Z-0.20;
Z=9.60-(X+Y);