Question

(3xy-5x+7)-[(2xy+x-2)-(xy+3x-3)] para y=1 e x=-3

Answer 1

(3.[-3].1 - 5.[-3] + 7) - [(2.{-3}.1+{-3} - 2) - (-3.1+3.{-3} - 3)]
(-9 +15+7) - [(-6 -3 -2) - (-3 -9 -3)]
(-9 +15+7) +6 +3 +2 + +3 +9 +3
13 + 26 = 39

Answer 2

(3.[-3].1 - 5.[-3] + 7) - [(2.{-3}.1+{-3} - 2) -(-3.1+3.{-3} - 3)]= (-9 +15+7) - [(-6 -3 -2) - (-3 -9 -3)]= (-9 +15+7) +6 +3 +2 + +3 +9 +3= 13 + 26 = 39