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128 - 3 ( x + 4 ) = 23
3 ( x + 4 ) = 128 - 23
3 ( x + 4 ) = 105
x + 4 = 105 : 5
x + 4 = 35
x = 35 - 4
x = 31
128 - 3 ( x + 4 ) = 23
3 ( x + 4 ) = 128 - 23
3 ( x + 4 ) = 105
x + 4 = 105 : 5
x + 4 = 35
x = 35 - 4
x = 31
k mik nha
720:[41-(2x-5)]=2^3.5
720:[41-2x+5]=40
[41+5-2x]=720:40
46-2x=18
2x=46-18
2x=28
x=14
a, 2x.4=128
2x=128:4
2x=32
2x=25
x=5
Vay x=5
b, x15=x
x=1
Vay x=1
\(\left(x+15\right)-125=5^7:5^5\)
\(\Rightarrow\left(x+15\right)-125=5^2\)
\(\Rightarrow\left(x+15\right)-125=25\)
\(\Rightarrow x+15=25+125\)
=> x+15=150
=> x=150-15
Vậy x=135.
\(720:\left[41-\left(2x-5\right)\right]=2^3.5\)
=> 720:[41-(2x-5)]=8.5
=> 720:[41-(2x-5)]=40
=> 41-(2x-5)=720:40
=> 41-(2x-5)=18
=> 2x-5=41-18
=> 2x-5=23
=> 2x=23+5
=> 2x=28
=> x=28:2
Vậy x=14.
\(2^7-3.\left(x+4\right)=23\)
=> 128-3.(x+4)=23
=> 3.(x+4)=128-23
=> 3.(x+4)=105
=> x+4=105:3
=> x+4=35
=> x=35-4
Vậy x=31.
\(2015^x.5^3=125\)
=> 2015x.53=53
=> 2015x=53:53
=> 2015x=1
=> 2015x=20150
Vậy x=0.
720 : [ 41 - ( 2x - 5 ) ] = 23 . 5
720 : [ 41 - ( 2x - 5 ) ] = 40
[ 41 - ( 2x - 5 ) ] = 720 : 40
41 - ( 2x - 5 ) = 18
2x - 5 = 41 - 18
2x - 5 = 23
2x = 23 + 5
2x = 28
x = 28 : 2
x = 14
Vậy x = 14
a. 720 : [ 41 - ( 2x - 5 ) ] = 23 . 5
=> 720 : [ 41 - (2x-5) ] = 8.5
=> 720 : [ 41 - (2x-5) ] = 40
=> 41 - (2x-5) = 720 : 40
=> 41 - (2x-5) = 18
=> 2x - 5 = 41 - 18
=> 2x - 5 = 23
=> 2x = 23 + 5
=> 2x = 28
=> x = 28 : 2
=> x = 14 thuộc Z
vậy______
b. ( 3x - 24 ) . 74 = 2.75
=> 3x-16 = 2.75 : 74
=> 3x - 16 = 2.7
=> 3x - 16 = 14
=> 3x = 14 + 16
=> 3x = 30
=> x = 30 : 3
=> x = 10 thuộc Z
vậy_____
\(71+\left(26-3x\right)\div5=75\)
\(\left(26-3x\right)\div5=4\)
\(26-3x=20\)
\(3x=6\Leftrightarrow x=2\)
\(20-\left[7\left(x-3\right)+4\right]=2\)
\(7x-21+4=18\)
\(7x-17=18\)
\(7x=25\Leftrightarrow x=\frac{25}{7}\)
720 : [41-(2x-5)] =2^3 . 5
<=> 41-(2x-5)=720:40=18
<=> 2x-5=41-18=23
<=>2x=23+5=28
<=> x=28:2=14
2^x-15=17
<=> 2^x=17+15=32
<=> 2^x=2^5
<=> x=5
(7x-11)^3= 2^5.5^2+200
<=> (7x-11)^3=1000
<=> (7x-11)^3=10^3
<=> 7x-11=10
<=> 7x=10+11=21
<=> x=21:7=3