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a) \(5.\left(x-3\right)=15\)
\(x-3=15:5\)
\(x-3=3\)
\(x=6\)
b)\(10+2.x=4^5:4^3\)
\(10+2.x=16\)
\(2x=16-10\)
\(2x=6\)
\(x=3\)
c) \(5^{x+1}=125\)
\(5^{x+1}=5^3\)
\(x+1=3\)
\(x=2\)
d) \(5^{2x-3}-2.5^2=5^2.3\)
\(5^{2x-3}=2.5^2+5^2.3\)
\(5^{2x-3}=125\)
\(5^{2x-3}=5^2\)
\(2x-3=2\)
\(2x=6\)
\(x=3\)
Mk nhanh nek bn
a/ 2x . 7 = 224
2x = 224 : 7
2x = 32
2x = 25
x = 5.
b/ 32x + 1 . 11 = 2673
32x + 1 = 2673 : 11
32x + 1 = 243
32x + 1 = 35
32x = 35 - 1
32x = 34
2x = 4
x = 4 : 2
x = 2.
c/ (3x + 5)2 = 289
(3x + 5)2 = 172
3x + 5 = 17
3x = 17 - 5
3x = 12
x = 12 : 3
x = 4.
d/ x . (x2)3 = x5
x1 . x5 = x5
x6 = x5
=> x = 0 hoặc x = 1
a) 2x x 7=224
2x=224:7
2x=32
2x=25
=> x=5
Vậy x=5
b) 32x+1 x 11=2673
32x+1=2673:11
32x+1=243
32x+1=35
=> 2x+1=5
x=(5-1):2
x=2
Vậy x=2
c) (3*x+5)2=289
(3*x+5)2=172
=> 3*x+5=17
x=(17-5):3
x=4
Vậy x=4
d) x.(x2)3=x5
x.x6=x5
x=x5:x6
x=x-1
a) 4x + 32 = 3.25
4x =64
X =3
b) 86 - 5( x+8) =36
5(x+8)= 50
x= 2
c) 38-3./x/ -5.(24-22.3) { đề lỗi r hay s đấy bn }
d) 2018 < /x/ < 2020
X= - 2019, -2020, 2019, 2020
a) \(2^x=16\) b) \(3^{2x-1}=243\)
\(\Rightarrow2^4=16\) \(2x-1=243:3\)
Vì : 2 . 2 . 2 . 2 = 16 \(2x-1=81\)
Vậy x = 4 \(2x=81+1\)
\(2x=82\)
=> x = \(\varnothing\)
a) 2x - 15 = 13
=> 2x = 13 + 15
=> 2x = 28
=> x = 14
128 - (x + 5) = 23
=> x + 5 = 128 - 23
=> x + 5 = 105
=> x = 105 - 5
=> x = 100
[(x2 + 54) - 32] . 2 = 244
=> (x2 + 54) - 32 = 244 : 2
=> (x2 + 54) - 32 = 122
=> x2 + 54 = 122 + 32
=> x2 + 54 = 154
=> x2 = 154 - 54
=> x2 = 100
=> x2 = 102
=> x = 10
(3x - 1)3 = 125
=> (3x - 1)3 = 53
=> 3x - 1 = 5
=> 3x = 5 + 1
=> 3x = 6
=> x = 2
Bài 1: Tìm x biết
a, 2x - 15= 13
2x = 13 + 15
2x = 28
x = 28 : 2
x = 14
Vậy x = 14
128 - (x + 5)= 23
x + 5 = 128 - 23
x + 5 = 105
x = 105 - 5
x = 100
Vậy x = 100
[( x2+54) - 32].2= 244
( \(x^2\) + 54 ) - 32 = 244 : 2
( x2+54) - 32 = 122
x2+54 = 122 + 32
x2+54 = 154
x2 = 154 - 54
x2 = 100
\(x^2\) = \(10^2\)
x =10
(3x -1)3= 125
\(\left(3x-1\right)^3\) = \(5^3\)
3x -1 = 5
3x = 5 + 1
x = 6 : 3
x = 2
b, 100: ( 2x+5 )= 4
2x + 5 = 100 : 4
2x + 5 = 25
2x = 45 - 5
2x = 40
x = 40 : 2
x = 20
[( 8x-14 ) :2 - 2]. 31= 341
( 8x - 14 ) : 2 - 1 = 341 : 31
( 8x - 14 ) :2 -2 = 11
( 8x - 14 ) : 2 = 11 + 2
( 8x - 14 ) : 2 = 13
8x - 14 = 13 . 2
8x - 14 = 26
8x = 26 + 14
8x = 40
x = 40 : 8
x = 5
1230 :3 (x - 20 )= 10
3 ( x - 20 ) = 1230 : 10
3 ( x - 20 ) = 123
x - 20 = 123 : 3
x- 20 = 41
x = 41 + 20
x= 61
Câu cuối mk chịu
Tk mk nha
a){720:[41-(7.2\(^2\)- X)] }:(2\(^3\).5)=1
{720:[41-(7.4-X)] }:(8.5)=1
{720:[41-(28-X)] }:40=1
41-(28-X):40=1.720
41-(28-X):40=720
(28-X):40=720+41
(28-X):40=716
28-X =716.40
28-X=28640
X=28-28640
X=(-28612)
b)420+65.4=(x+175):5+30
420+260=(x+175):5+30
280=(x+175):5+30
(x+175):5=280-30
(x+175):5=250
x+175=250.5
x+175=1250
x=1250-175
x=1075
c)(32.15):2=(x+70):14-40
480:2=(x+70):14-40
240=(x+70):14-40
(x+70):14=240+40
(x+70):14=280
x+70=280.14
x+70=3920
x=3920-70
x=3850
gửi đi
5 . x2 - 3 . x2 = 32
x2 . ( 5 - 3 ) = 32
x2 : 2 = 32
x2 = 32 . 2
x2 = 64
x2 = 82
=> x = 8
k mình nha đúng đó !