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a) 2³.(20 - 2x) = 4.2⁵
8.(20 - 2x) = 4.32
8.(20 - 2x) = 128
20 - 2x = 128 : 8
20 - 2x = 16
2x = 20 - 16
2x = 4
x = 4 : 2
x = 2
b) 3²⁺ˣ = 81
3²⁺ˣ = 3⁴
2 + x = 4
x = 4 - 2
x = 2
3x-5 . 32x = 81
3(x-5)+2x = 34
\(\Rightarrow\)( x - 5 ) + 2x = 4
\(\Rightarrow\)3x - 5 = 4
\(\Rightarrow\)3x = 4 + 5
\(\Rightarrow\)3x = 9
\(\Rightarrow\)x = 9 : 3
\(\Rightarrow\)x = 3
a: Ta có: \(71-\left(x+33\right)=26\)
\(\Leftrightarrow x+33=45\)
hay x=12
b: Ta có: \(\left(x+73\right)-26=76\)
\(\Leftrightarrow x+73=102\)
hay x=29
c: Ta có: \(45-\left(x+9\right)=6\)
\(\Leftrightarrow x+9=39\)
hay x=30
a) 71 - ( 33 + x ) = 26
(33 + x ) = 71 -26
33 + x = 45
x = 45 - 33 = 12
b) ( x + 73 ) - 26 = 76
( x + 73 ) = 102
x = 102 - 73 = 29
c) 45 - ( x + 9 ) = 6
( x + 9 ) = 45 - 6 = 39
x = 39 - 9 = 30
d) 89 - ( 73 - x ) = 20
73 - x = 89 - 20
73 - x = 69
x = 73 - 69 = 4
e) 4(x+41) = 400
x + 41 = 400 : 4 = 100
x = 100 - 41 = 59
f) 11(x-9 ) = 77
x - 9 = 77 : 11 = 7
x = 7 + 9 = 16
g) x + 7 = 25 + 13 = 38
x = 38 - 7 = 31
h) x + 4 = 198 - 120 = 78
x = 78 - 4 = 74
i) x - 9 = 350 : 5 = 70
x = 70 + 9 = 79
j) 2x - 49 = 5 . 9 = 45
2x = 45 + 49 = 94
x = 94 : 2 = 47
k) 25 + 3( x - 8 ) = 106
3(x-8 ) = 106 - 25 = 81
x - 8 = 81 : 3 = 27
x = 27 +8= 35
l) 9( x + 4 ) - 25 = 20
9( x + 4 ) = 20 + 25 = 45
x + 4 =45 : 9 = 5
x = 5 - 4 = 1
m) 200 - ( 2x + 6 ) = 64
2x + 6 = 200 - 64 = 136
2x = 136 - 6 = 130
x = 130 : 2 = 65
\(\Leftrightarrow x-2015>0\left(-5< 0\right)\\ \Leftrightarrow x>2015\)
5x=125
=>5xx=53
=> x=3
Vậy x=3
32x=81
=>32x=34
=>2x=4
=>x=4:2=2
Vậy x=2
Tk mk
a, => 5^x = 5^3
=> x = 3
b, => 3^2x = 3^4
=> 2x = 4
=> x = 2
Tk mk nha
3x-5.32x=81
=>3x-5+2x=34
=>x-5+2x=4
=>x+2x-5=4
=>3x=4+5
=>3x=9
=>x=3
a/ 2x(x-5)-x(3+2x)=26
=>2x2-10x-2x2-3x=26
=>-13x=26
=>x=-2
b/ 49x2-81=0
=>49x2=81
=>x2=\(\frac{49}{81}\)
\(\Rightarrow x^2=\left(-\frac{9}{7}\right)^2\)hoặc \(\left(\frac{9}{7}\right)^2\)
\(\Rightarrow x=\pm\frac{9}{7}\)
2x(x - 5) - x(3 + 2x) = 26
2x2 - 10x - 3x - 2x2 = 26
- 13x = 26
x = 26 : (- 13)
x = - 2
49x2 - 81 = 0
(7x - 9)(7x + 9) = 0
Th1:
7x - 9 = 0
7x = 9
x = 9/7
Th2:
7x + 9 = 0
7x = - 9
x = - 9/7
Vậy x = 9/7 hoặc x = - 9/7