For nonzero rational numbers a and b, the definition and operation are as follows: a*b = a-b/a+b, then-3*4=() Why are the answers different?

For nonzero rational numbers a and b, the definition and operation are as follows: a*b = a-b/a+b, then-3*4=() Why are the answers different?

That solution is right.

What is the value of (-4)&3&(-2) if, for any nonzero rational number a, b, the defined operation & is: a & b =-1?

0