因为a*b=a+b/a所以1*2=1+2/1=33*3=3+3/3=4
(1×2)×3=(1+2/1)×3=3×3=3+3/3=3+1=4
1*2=(1+2/1)=33*3=3+3/3=4
axb=a+b/a1即a 2即b1×2=1+2/1=3(1x2)x3=3×3=3+3/3=4
4