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( 10 - 4x ) + 120 : 23 = 12 + 42
( 10 - 4x ) + 120 : 8 = 1 + 16
( 10 - 4x ) + 15 = 17
10 - 4x = 17 - 15
10 - 4x = 2
4x = 10 - 2
4x = 8
x = 8 : 4
x = 2
Ta có:
10 - 4x + 120:23 = 1 + 42
=> 10 - 4x + 15 = 1 + 16
=> 4x - 5 = 17
=> 4x = 17 + 5 = 22
=> x = 22/4
Vậy: x = 22/4
a.20-[7(x-3)+4]=2
[7(x-3)+4]=18
7(x-3)=18-4
7(x-3)=14
x-3=2
x=5
Vậy x=5
b.4x3+12=120
4x3=200-12
4x3=188
x3=188:4
x3=47
\(\Rightarrow x\in\notin\)
c.3 . 2x-3=45
2x-3=45:3
2x-3=15
2x=15+3
2x=18
\(\Rightarrow x\in\notin\)
a) 2.3x+2 + 4.3x+1 = 10.32019
<=> 3x+1(6 + 4) = 10.32019
<=> 10.3x+1 = 10.32019
<=> 3x+1 = 32019
<=> x = 2018.
b) (9-4x)3 = 125 = 53
<=> 9 - 4x = 5
<=> 4 = 4x
<=> x = 1
c) 2.22.23....2x = 1024 = 210
<=> 2(1+2+3+...+x) = 210
<=> 1+2+3+...+x = 10
<=>x.(x+1)/2 = 10
<=> x(x+1) = 20 = 4.5
<=> x = 4.
72 x 5-(2x+1)=630:9
<=> 49 x 5-2x-1=70
<=> 245-2x-1=70
<=> -2x+244=70
<=> -2x=-174
<=> x=87
tìm x biết:
a, 72.5-(2x+1)=630:9
49.5-(2x+1)=70
245-(2x+1)=70
2x+1=245-70
2x+1=175
2x=175-1
2x=174
x=174:2
x=87
Vậy x=87
b, (10-4x)+120:23=17
(10-4x)+120:8=17
(10-4x)+15=17
10-4x=17-15
10-4x=2
4x=10-2
4x=8
x=8:4
x=2
Vậy x=2
a) \(2^x+2^{x+1}=96\Leftrightarrow2^x+2\cdot2^x=96\Leftrightarrow2^x\cdot3=96\Leftrightarrow2^x=48\)
Không có x nguyên thỏa mãn.
b) \(3^{4x+4}=81\Leftrightarrow3^4\cdot3^x=3^4\Leftrightarrow3^x=1\Leftrightarrow x=0\)
Tìm x, biết:
a) 198 - ( x + 4 ) = 120
(x+4) = 198-120
x+ 4 =78
x= 78 - 4
x= 74
b) 2(x-51) = 2.23 + 20
2(x-51)=36
x-51 = 36:2
x-51=18
x=18+51
x=69
c) 450 : ( x - 19 ) = 50
x-19= 450:50
x-19=9
x=9+19
x=28
d)4(x-3) = 72 - 110
4(x-3) =48
x-3 = 48:4
x-3=12
x=12+3
x=15
a) 198 - ( x + 4 ) = 120
=>x+4=78
=>x=744
b) 2(x-51) = 2.23 + 20
=>
TBR, Ta có:
(100 – 4x) + 120 : 23 = 1 + 42
\(\Rightarrow\) 10 – 4x + 15 = 17
= 25 – 4x = 17 \(\Rightarrow\) 4x = 25 – 17 \(\Rightarrow\) 4x = 25 – 17
\(\Rightarrow\) 4x = 8 \(\Rightarrow\)x = 8 : 4 = 2
\(\left(10-4x\right)+120:2^3=1+4^2\)
\(\Rightarrow\) \(\left(10-4x\right)+120:8=17\)
\(\Rightarrow\) \(\left(10-4x\right)+15=17\)
\(\Rightarrow\) \(10-4x=2\)
\(\Rightarrow\) \(4x=8\)
\(\Rightarrow\) \(x=2\)