Question

5. Calcule o valor numérico das expressões:
a) x-y (para x =5 e y = -4)
b) 3x + a (para x=2 e a=6)
c) 2x + m (para x = -1 e m= -3)
d) m -2 a (para m =3 e a = -5)
e) x + y ( para x = 12e y = -1/5)
f) a - b (para a =3 e b = -1/2)
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Answer 1

a)x-y=5-(-4)= 5+4= 9

b)3x+a= 3•(2)+6=6+6= 12

c)2x+m= 2•(-1)+(-3)=-2-3= -5

d)m-2a= 3-2(-5)=3+10= 13

e)x+y= 12+(-1/5)= 60/5-1/5= 59

f)a-b= 3-(-1/2)= 6/2+1/2= 7

Answer 2

a) x-y 5-4=1

b)3x+a 3.2+6 6+6=12

c)2x+m 2.(-1)-3 -2-3=-5

d)m-2a 3-2. (-5) 3-10=-7

e)x+y 12+ (-1/2) 12/1+(-1/2)=-24/1

f)a-b 3-(-1/2) 3/1-(-1/2)= 6/1