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1/2 xy+ (3/4+1)* x^2y - 5/2 xy^2 - 5/3
1/2 xy+ 7/4 x^2y-5/2 xy^2-5/3
SEGUNDO
(2+5)*xy - (1+4)x^2 +10-2
7xy - 5x^2 +8
TERCER
(2+6-12)*xy +(15-1)xz + 5 yz
-4xy +15xz + 5 yz