2*1,就是当x=2,y=1,代入x*y=ax+by+xy得,
2*1=2a+b+2×1=7
2a+b=5 (1)
(-3)*3=(-3)a+3b+(-3)×3=3
-a+b=4 (2)
(1)-(2)得,
a=1/3,b=13/3
所以,x*y=1/3x+13/3y+xy
1/3*6=1/3×1/3+13/3×6+1/3×6=253/9