[求助]请问一道GWD 16-Q31: math

Q31:

A certain right triangle has sides of length x, y, and z, where x < y < z.  If the area of this triangular region is 1, which of the following indicates all of the possible values of y ?

A.    y >

B.     < y <

C.     < y <

D.     < y <

E.     y <

Answer: A  y>根号2 

这个，难道不是这样么？

the area of this triangular region is 1 可以推出 xy=2

x < y < z  可以推出   xy<y*y

综合上面2个，Y平方大于2，即Y大于根号2