a*b=1/3 a-1/4 b
2*(2*x)=1*x
解
2*(2/3-x/4)=1/3-x/4
2/3-1/4(2/3-x/4)=1/3-x/4
1/2+x/16=1/3-x/4
5/16 x=-1/6
解得x= -8/15
5*(-5)=1/3×5-1/4×(-5)=5/3+5/4=35/12
a*b=1/3 a-1/4 b
2*(2*x)=1*x
解
2*(2/3-x/4)=1/3-x/4
2/3-1/4(2/3-x/4)=1/3-x/4
1/2+x/16=1/3-x/4
5/16 x=-1/6
解得x= -8/15
5*(-5)=1/3×5-1/4×(-5)=5/3+5/4=35/12