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4*2^x-3=125
4*2^x =125+3
4*2^x =128
2^x =128:4
2^x =32
2^x =2^5
vậy x=5
4*2^x=125+3
4*2^x=128
2^x=128/4
2^x=32
2^x=2^5
suy ra x =5
Vậy x =5
4 . 2x - 3 = 125
=> 4 . 2x = 128
=> 2x = 32
=> 2x = 25
=> x = 5
\(4x^3+15=47\)
\(\Leftrightarrow4x^3=32\)
\(\Leftrightarrow x^3=8\)
\(\Leftrightarrow x^3=2^3\)
\(\Leftrightarrow x=2\)
\(4.2^x-3=125\)
\(\Leftrightarrow4.2^x=128\)
\(\Leftrightarrow2^x=32\)
\(\Leftrightarrow2^x=2^5\)
\(\Leftrightarrow x=5\)
a) 4x3+15=47
=> 4x3=47-15
=> 4x3=32
=> x3=32:4
=> x3=23
=> x=2
b) 4.2x-3=125
=> 4.2x=125+3
=> 2x=128:4
=> 2x=32
=> 2x=25
=> x=5
4x3 + 15 = 47
4x3 = 47 - 15
4x3 = 32
x3 = 32 : 4
x3 = 8
x3 = 23
x = 2
b) 4 . 2x - 3 = 125
4 . 2x = 125 + 3
4 . 2x = 128
2x = 128 : 4
2x = 32
2x = 25
x = 5
\(4x^3+15=47\)
\(\Leftrightarrow4x^3=32\)
\(\Leftrightarrow x^3=8\)
\(\Leftrightarrow x=2\)
\(4\cdot2^x-3=125\)
\(\Leftrightarrow4\cdot2^x=128\)
\(\Leftrightarrow2^x=32\)
\(\Leftrightarrow2^x=2^5\)
\(\Leftrightarrow x=5\)
4x3 + 15 = 47
=> 4x3 = 47 - 15 = 32
=> x3 = 32 : 4 = 8 = 23
=> x = 2
4.2x - 3 = 125
=> 4.2x = 125 + 3 = 128
=> 2x = 128 : 4 = 32 = 25
=>x = 5
\(a)\)\(11-\left(15+11\right)=x-\left(25-9\right)\)
\(\Leftrightarrow\)\(x-\left(25-9\right)=11-\left(15+11\right)\)
\(\Leftrightarrow\)\(x-\left(25-9\right)=11-26\)
\(\Leftrightarrow\)\(x-16=-15\)
\(\Leftrightarrow\)\(x=-15+16\)
\(\Leftrightarrow\)\(x=1\)
\(b)\)\(4.2^x-3=125\)
\(\Leftrightarrow\)\(4.2^x=125+3\)
\(\Leftrightarrow\)\(4.2^x=128\)
\(\Leftrightarrow\)\(2^x=128\div4\)
\(\Leftrightarrow\)\(2^x=32\)
\(\Leftrightarrow\)\(2^x=2^5\)
\(\Leftrightarrow\)\(x=5\)
/ x - 47 / - 115 = 0
x - 47 = 0 + 115
x - 47 = 115
x = 115 + 47
x = 162
215 + ( 146 - x ) = 401
146 - x = 401 - 215
146 - x = 186
x = 186 - 146
x = 40
4 . 2x - 3 = 125
4 . 2x = 125 + 3
4 . 2x = 128
2x = 128 : 4
2x = 32
2x = 25
x = 5 + 0
x = 5
Hok Tốt !!
a/ |x-47| - 115 = 0
|x-47| = 0+115 = 115
=> x-47=115 hay x-47=(-115)
x=115+47=162 hay x=(-115)+47= (- 68)
Vậy x = 162 hay x = -68
b/315 + (164-x) = 401
164-x = 401 - 315 = 86
x= 164-86 = 78
Vậy x=78
c/(3x-6).3=34
3x-6=34 : 3 =33 = 27
3x = 27 + 6 = 33
x= 33 : 3 =11
vậy x=11
d/4.2x - 3 = 125
4.2x = 125 +3 =128
2x= 128 : 4 = 32 = 25
=> x=5
Vậy x=5