Question

一道找规律填数题,绞尽脑汁都想不出来,

Answer 1

1/4 = (1 * 1)/(2 * 2) - 4 = - ((2 * 2) / (1 * 1))

4/9 = (2*2 ) / (3 * 3) -9/4 = - ( ( 3* 3 ) /( 2* 2))

9/16 = (3*3) / ( 4*4) 以后依次为 － 16/9

16 / 25 - 25 / 16