考研数学数三解析

\r2 .#$012&()A ,-??.\r7 ) 345\r678: :+(0, 1) ;<=>?@ABpC@ABDEF,GHI1 J\r2\rK L M\r1 1 3 2\r(A) - (B) - (C) - ( D ) -\r2 4 4 3\rN? OPQ??JRS.TU?@ABVWKx X y , CYx K\rZ[\pYy K][\"(x,y)<=^:_`K1 0a.b(Uc)p\rT ( ) A d c “U ? @ B D E  F , G H I ! ”p C h  * +\r2\rQ = {(x,y):0<x<l,0< y < 1 } ;()A h"ijKG ;Uk"pl.\rG = j(x ,y ):0 < x < 1,0< y < l,]y-n < g1 .O  Sn = \ , G \ri 3 q a\rSG =So  S [>S&=1 >1 = 1 pq P(A) = 1 = w