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Giovana899
@Giovana899
November 2019
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Calcule o valor numérico das expressões algébricas:
A) 5x -8, para x=4
B) 3- x2, quando x=3
C) a2 -5b , se a =4 e b= -1
D) x + 2y, para x=1/4 e y = 1/3
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Apul
A)
5x - 8
(5*4) - 8 = 20 - 8 = 12
B)
3 - 2x
3 - (2*3) = 3 - 6 = -3
C)
2a - 5b
(4*2) - (5*(-1)) = 8 + 5 = 13
D)
x + 2y
1/4 + (2*(1/3)) = 1/4 + 2/3 = 11/12
6 votes
Thanks 8
ventura1641ventura
A) 5×4-8; 20-8=12
b)3-(3)2; 3-6=-3
c)(4×2)+5×(-1); 8-5=3
d)1/4+2×1/3; 1/4+2/3; =11/12
ve se e iss mesno
6 votes
Thanks 3
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Lista de comentários
5x - 8
(5*4) - 8 = 20 - 8 = 12
B)
3 - 2x
3 - (2*3) = 3 - 6 = -3
C)
2a - 5b
(4*2) - (5*(-1)) = 8 + 5 = 13
D)
x + 2y
1/4 + (2*(1/3)) = 1/4 + 2/3 = 11/12
b)3-(3)2; 3-6=-3
c)(4×2)+5×(-1); 8-5=3
d)1/4+2×1/3; 1/4+2/3; =11/12
ve se e iss mesno