2.Let r be an odd integer with r>1,and let u,v be positive integers such that 2|u gcd (u,v) and u>2r v/π,Further let a,b,c be positive integers satisfying a+b-1=(u+v-1)~r and c=u~2+v~2.The value of Jacobi symbol (b/v)/(a/u) is determined.
6.Invisible under the stars, an ummanned American spyplane circled inaudibly over a stretch of dark landscape, transmitting grainy images back to the United States.
