GIF89a!!,!ڋ޼H扦ʶ L\z:L6;D*]=mO'E C~;N֞:n2;?ٚ-nޛ pLpp! MathType001 x,y()=gt()+s"gt()=t,t 3 ()+s1,3t 2 ()=t+s,t 3 +3st 2 ();