1- resolver as equações exponenciais
Anexos:
Anônimo:
h, i, j também? com a,, b e c?
Respostas
respondido por:
12
h)
- x + 2
6. 7 = 294
- x + 2
7 = 294/6
- x + 2
7 = 49
- x + 2 2
7 = 7
- x + 2 = 2
- x = 2 - 2
- x = 0
x = 0
--------------------------------------------------------
i)
2x - 3
2 . ( 1) = 4
( 4)
2x - 3
2 . ( 1 ) = 4
( 2²)
- 2 (2x - 3)
2 = 4/2
- 4x + 6 1
2 = 2
- 4x + 6 = 1
-4x = 1 - 6
-4x = - 5
x = 5
4
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
j)
x
4 = ∛32
2x ___
2 = ∛2⁵
2x 5
3
2 = 2
2x = 5
3
3.2x = 5
6x = 5
x = 5
6
*********************************************************
2)
a)
3 [ - 1 - 1 ] - 2
x = (- 1) + [ 3 - ( - 3) ]
( 3)
- 2
x = - 1 + [ 1 - ( - 1 )]
27 [ 3 ( 3)]
- 2
x = - 1 + [ 1 + 1 ]
27 [ 3 3 ]
- 2
x = - 1 + (2)
27 (3)
2
x = - 1 + (3)
27 (2)
x = - 1 + 9
27 4
x = - 4 + 243 = 239
108 108
27,4: 2
27,2: 2
27,1: 3
9,1: 3
3,1: 3
1,1 =2.2.3.3.3 = 4.27 = 108
====================================
b)
[ 1/3 1/2 2/3 1/2 ] 1/2
x = [ 27 + 64 - 8 + 4 ]
1/2
x = [∛27 + √64 - ∛8² + √4 ]
1/2
x = [∛3³ + 8 - ∛64 + 2 ]
1/2
x = [ 3 + 8 + 2 - ∛4³]
1/2
x = [ 13 - 4]
1/2
x = 9
x = √9
x = + 3 e x = - 3
*************************************
c)
- 3 - 1 - 1
x = ( - 2)³ - 3² + [ ( - 1) . 2 ] : ( 1 )
[ ( 2) ] ( 4 )
x = - 8 - 9 + [ (- 2)³ . 1 ] : 4
[ 2 ]
x = - 17 + [ - 8 ] : 4
[ 2 ]
x = - 17 - 4 : 4
x = - 17 - 1
x = - 18
- x + 2
6. 7 = 294
- x + 2
7 = 294/6
- x + 2
7 = 49
- x + 2 2
7 = 7
- x + 2 = 2
- x = 2 - 2
- x = 0
x = 0
--------------------------------------------------------
i)
2x - 3
2 . ( 1) = 4
( 4)
2x - 3
2 . ( 1 ) = 4
( 2²)
- 2 (2x - 3)
2 = 4/2
- 4x + 6 1
2 = 2
- 4x + 6 = 1
-4x = 1 - 6
-4x = - 5
x = 5
4
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
j)
x
4 = ∛32
2x ___
2 = ∛2⁵
2x 5
3
2 = 2
2x = 5
3
3.2x = 5
6x = 5
x = 5
6
*********************************************************
2)
a)
3 [ - 1 - 1 ] - 2
x = (- 1) + [ 3 - ( - 3) ]
( 3)
- 2
x = - 1 + [ 1 - ( - 1 )]
27 [ 3 ( 3)]
- 2
x = - 1 + [ 1 + 1 ]
27 [ 3 3 ]
- 2
x = - 1 + (2)
27 (3)
2
x = - 1 + (3)
27 (2)
x = - 1 + 9
27 4
x = - 4 + 243 = 239
108 108
27,4: 2
27,2: 2
27,1: 3
9,1: 3
3,1: 3
1,1 =2.2.3.3.3 = 4.27 = 108
====================================
b)
[ 1/3 1/2 2/3 1/2 ] 1/2
x = [ 27 + 64 - 8 + 4 ]
1/2
x = [∛27 + √64 - ∛8² + √4 ]
1/2
x = [∛3³ + 8 - ∛64 + 2 ]
1/2
x = [ 3 + 8 + 2 - ∛4³]
1/2
x = [ 13 - 4]
1/2
x = 9
x = √9
x = + 3 e x = - 3
*************************************
c)
- 3 - 1 - 1
x = ( - 2)³ - 3² + [ ( - 1) . 2 ] : ( 1 )
[ ( 2) ] ( 4 )
x = - 8 - 9 + [ (- 2)³ . 1 ] : 4
[ 2 ]
x = - 17 + [ - 8 ] : 4
[ 2 ]
x = - 17 - 4 : 4
x = - 17 - 1
x = - 18
respondido por:
3
Resposta:
h) x=0 i) x=5/4 j)x=5/6
2) a)239/108 b) x=9 c) x=-16
================
EQUAÇÕES EXPONENCIAS:
(
=================
2) Resolva as Equações:
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