... )1(12C1C1)o(yx3e2xxe2Cx3e1Cy=+⇒=++=)2(9212C1C39)o('yx3xe23x3e21xe2Cx3e1C3'y=++⇒=+++=⇒-Giải hệ [ ]xxxxeeeyCCCCCCCC3312 11 2121 2111 5414 11 415 11 4152152)2(2173)1(1+−=⇒−=−=−==⇒=⇒=+=+37 1/2 1 2 xMiền ... =0 ; x =2 −+=−−=⇔⇔=+−⇔−=2 11 2 11 122)1(22yxyxyxxxy 222yxxy =⇔=→ 321DDDD =với D1 = −−≤≤≤≤2 11 2210:),(yxyyyx≤≤≤≤=22221:),(2xyyyxD≤≤−+≤≤=22 11 10:),(3xyyyxD ... −−≤≤≤≤2 11 2210:),(yxyyyx≤≤≤≤=22221:),(2xyyyxD≤≤−+≤≤=22 11 10:),(3xyyyxD Vậy → ∫∫=−−222 11 10yydyI+dxyxf ),(+∫∫+−+dxyxfdyy),(2 11 10 2dxyxfdyy),(22122∫∫Câu 14 : (2đ)∫...