这个题作何理解啊？求解答

Question

 

Answer 1

(1)  x*=3+2 ==> x=x*(3+2) = 1*5 =5

(2) x*=y=z=5 ==> z=5,y=z=5,x=x*y= 5 * 5 = 25

(3) x=y==z  ==>  y==z ? 5==5 ==>1  ,x=1