Determine o valor numérico das expressões

a) m-n,para m= -7 e n= -2
b) 2x+3,para x = -2
c) x² + 2x + 1,para x= 2
d) x² - 2x + 1,para x= 1

Resolva as questões do 1º grau

a) x - 5 = -6
b) 2x - 4 = 8
c) 3x - x + 1 = -7
d) 2(2x + 6) = 4
e) 5x-10 = 2x + 2

Resolva:

a) -4+5-9+1 =
b) 2-3-10 =
c) (-4) - (-9)+ (-1) =
d) (-2).(-5) =
e) 6:(-2) =
f) (-2)² =
g) (-2)³ =
h) (+2)³ =
i) (-2)
j) 1²0 =
k) 20¹ =
l) 2 -¹ =
m) 2 -² =
n)2 -³ =
o) (1/2)² =
p) (1/2)-² =
q) 3/5+1/6-1/2 =
r) 4-2/5 =
s) 4.1/2.3/5 =
t) 2/3 : 1/2 =

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Respostas

2014-02-07T01:10:06-02:00
A) m-n,para m= -7 e n= -2
b) 2x+3,para x = -2
c) x² + 2x + 1,para x= 2
d) x² - 2x + 1,para x= 1

Resolva as questões do 1º grau

a) x - 5 = -6
b) 2x - 4 = 8 
c) 3x - x + 1 = -7
d) 2(2x + 6) = 4
e) 5x-10 = 2x + 2

Resolva:

a) -4+5-9+1 = -16 +6 = -7
b) 2-3-10 = 2 - 13 = -11 
c) (-4) - (-9)+ (-1) = -4 + 9 + 1 = 6
d) (-2).(-5) = +10
e) 6:(-2) = -3
f) (-2)² = 4
g) (-2)³ = -8
h) (+2)³ = 8
i) (-2) = -2
j) 1²0 =  se for 1² = 1 se for 1² * 0 = 0
k) 20¹ = 20
l) 2 -¹ = (1/2)¹ = 1/2
m) 2 -² = (1/2)² = 1/4
n)2 -³ = (1/2)³ = 1/8
o) (1/2)² = 1/4
p) (1/2)-² =  (2/1)² = 4/1 = 4
q) 3/5+1/6-1/2 = 18/30 + 5/30 -15/30 = 23/30 - 15/30 = 8/30 = 4/15
r) 4-2/5 = 4/1 - 2/5 = 20/5 - 2/5 =  18/5
s)  4.1/2.3/5 = 4/2 . 3/5 = 12/10 = 6/5
t) 2/3 : 1/2 = 2/3 . 1/2 = 2/6 = 1/3
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