owen-green_60a68213b8147
owen-green_60a68213b8147
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a)2x + 5y quando x =+7 e y=-2 2*7 = 14 5*(-2) = -10 14-10 = 4 b)xy + 2x, quando x= -6 e y =-3 (-6)*(-3) = -18 2*(-6) = -12 (-18)+(-12) = -30 c)3a -7b, quando a =+8 e b = - 7 3*8 = 24 (-7)*(-…