Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a) (4600 + 6400) -7.x=3839
11000 - 7.x=3839
7.x=11000-3839
7.x=7161
x=7161:7
x=1023
b) (8x-14) :2-2= 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
a) 219 - 7(y+1) = 100
7(y+1) = 119
y+1 = 17
y = 16
các bài cn lại lm tương tự nha!
( 4600 + 6400 ) - 7x = 3839
11000 - 7 . x = 3839
7 . x = 11000 - 3839
7 . x = 7161
x = 7161 : 7
x = 1023
Vậy x = 1023
a) 9000 - 3 . x=1200
3.x =9000 - 1200
3.x =7800
x =7800:3
x=2600
b) [(6x - 72) : 2 - 84]. 28 = 5628
[(6x - 72) : 2 - 84] = 5628 : 28
(6x - 72) : 2 - 84 = 201
(6x - 72) : 2 = 201 + 84
(6x - 72) : 2 = 285
(6x - 72) = 285 . 2
6x - 72 = 570
6x =570+72
6x = 642
x = 642 : 6
x = 107
c) (3. x - 2^4) = 2. 7^4 : 7^3
(3. x - 16) = 2. 7
3. x - 16 = 14
3. x = 14 + 16
3. x = 30
x = 30 : 3
x = 10
a) (2600+6400) - 3. x = 1200
9000-3.x=1200
3.x=9000-1200
3.x=7800
x=7800:3
x=2600
b) [(6x - 72) : 2 - 84]. 28= 5628
[(6x - 72) : 2 - 84] =5628:28
(6x - 72) : 2 - 84 =201
(6x - 72) : 2 =201+84
(6x - 72) : 2 = 285
(6x - 72) =285x2
6x - 72 =570
6x =570+72
6x =642
x =642:6
x =107
c) (3. x - 24) . 73= 2. 74
tí nk làm,mà bài này dễ bạn tự suy nghĩ đi,tính lũy thừa trước nà
a) 22.14x . 72 = 14100
=> (2.7)2 . 14x = 14100
=> 14x = 14100 : 142
=> 14x = 1498
=> x = 98
b) 15.x + 3(x + 2) = 96
=> 15x + 3x + 6 = 96
=> 18x = 96 - 6
=> 18x = 90
=> x = 90 : 18 = 5
c) 2x + 4.2x = 5.25
=> 2x(1 + 4) = 5.25
=> 2x .5= 5.25
=> 2x = 5.25 : 5
=> 2x = 25
=> x = 5
\(a,2^2.14^x.7^2=14^{100}\)
\(\Rightarrow14^2.14^x=14^{100}\)
\(\Rightarrow14^x=14^{98}\)
\(\Rightarrow x=98\)
\(b,15.x+3\left(x+2\right)=96\)
\(\Rightarrow3\left(5x+x+2\right)=96\)
\(\Rightarrow6x+2=32\)
\(\Rightarrow6x=30\)
\(\Rightarrow x=5\)
\(c,2^x+4.2^x=5.2^5\)
\(\Rightarrow2^x\left(1+4\right)=5.2^5\)
\(\Rightarrow2^x.5=5.2^5\)
\(\Rightarrow2^x=2^5\)
\(\Rightarrow x=5\)
2(3x +2) -15=4x+9
6x+12-4x=9+15
6x - 4x=24-12
(6-4)x=12
2x=12
x=6
Vậy x=6
bik thế thoi ak
[(8x-14):2-2].31=341
=> (8x-14):2-2=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
4x+3=256
=> 4x+3=44
=> x+3=4
=> x=4-3
=> x=1
6+3x+2=87
=> 3x+2=87-6
=> 3x+2=81
=> 3x+2=34
=> x+2=4
=> x=4-2
=> x=2
1300:[120-(x-9)]=25
=> 120-(x-9)=1300:25
=> 120-(x-9)=52
=> x-9=120-52
=> x-9=68
=> x=68+9
=> x=77
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)(4600 + 6400) - 7.x = 3839
11000-7x=3839
7x=7161
x=1023
Vậy x=1023
b)[(8x - 14 ) : 2 - 2 ]. 31 = 341
(8x - 14 ) : 2 - 2=11
(8x - 14 ) : 2=13
8x - 14 =26
8x=40
x=5
Vậy x=5
c)2.(x - 3) - x = 4.2^3
2.(x - 3) - x=32
2x-6-x=32
x-6=32
x=38
Vậy x=38
Bài 1 : Tìm x
a, ( 4600 + 6400 ) - 7.x = 3839
11000 - 7.x = 3839
7.x = 11000 - 3839
7.x = 7161
x = 7161: 7
x = 1023
b, [ ( 8x - 14 ) : 2 - 2 ] . 31 = 341
( 8x -14 ) : 2 -2 = 11
( 8x -14 ) : 2 = 13
8x -14 = 26
8x = 40
x = 5
c, 2. ( x -3 ) - x = 4. 23
2x - 6 - x = 32
x - 6 = 32
x = 38