112 - (x+4)=1339:13
468+85xX=2508
Xx2,5=2,5x4
x-270:45=120
575-(6xX+70=445
x-105:21=15
3200:(405-x)=8
43575-75xX=42450
8,75xX+1,25xX=20
tìm x:
a) X-270:45=120
b) 575- ( 6x X+70 ) = 445
c) X - 105 : 21 = 15
d) 3200 : ( 405- x ) = 8
i) 43575 - 75 x X = 42450
e) 8,75 x X + 1,25 x X = 20
Ai làm đc câu nào thì giúp mik với:>
a) \(x-270:45=120\)
\(x-270=120.45\)
\(x-270=5400\)
\(x=5400+270\)
\(x=5670\)
_____
b) \(575-\left(6\times x+70\right)=445\)
\(6\times x+70=575-445\)
\(6\times x+70=130\)
\(6\times x=130-70\)
\(6\times x=60\)
\(x=60:6\)
\(x=10\)
_____
c) \(x-105:21=15\)
\(x-105=15.21\)
\(x-105=315\)
\(x=315+105\)
\(x=420\)
_____
d) \(3200:\left(405-x\right)=8\)
\(405-x=3200:8\)
\(405-x=400\)
\(x=405-400\)
\(x=5\)
_____
i) \(43575-75\times x=42450\)
\(75.x=43575-42450\)
\(75.x=1125\)
\(x=1125:75\)
\(x=15\)
_____
e) \(8,75\times x+1,25\times x=20\)
\(x\times\left(8,75+1,25\right)=20\)
\(x\times10=20\)
\(x=20:10\)
\(x=2\)
a) x = 5670
b) x = 10
c) x = 420
d) x = 5
i) x = 15
e) x = 2
Có ai giúp mình k ạ:
Bài 1: Tìm x
A,2.x-138=2 mũ3 . 3 mũ 2
B,10+2.x= 4mũ 5 ÷4 mũ 3
C, 70-5.(x-3) = 45
D, 21-(x-6)=1339÷13
2x - 138 = 23 . 32
2x - 138 = 72
2x = 72 + 138
2x = 210
x = 105
10 + 2x = 45 : 43
10 + 2x = 16
2x = 16 - 10
2x = 6
x= 3
105+20+305+30+405+50+605+70+705+80+905+100+105+110= ?
Tìm x :
a) 13 - 2 ( x + 1 ) = 7
b) 6x + 2 . 4 = 5^2 . 2
c) 420 + 65 . 4 = ( x + 175 ) : 5 + 30
d) 32 . 12 : 2 = ( x + 70 ) : 14 - 40
e) 231 - ( x - 6 ) = 1339 : 13
f) 10 + 2x = 4^5 : 4
g) 70 - 5 ( x - 3 ) = 45
a)13-2(x+1)=7
2.(x+1)=13-7
2.(x+1)=6
x+1=6/2
x+1=3
x=3-1
x=2
a, 13 - 2 ( x + 1 ) = 7
2 .( x + 1 ) = 13 - 7
2 .( x + 1 ) = 6
x + 1 = 6 : 2
x + 1 = 3
x = 3 - 1
x = 4
b)6x+2.4=52.2
6x+2=50
6x=48
x=8
c)420+65.4=(x+175):5+30
(x+175):5+30=680
(x+175):5=650
x+175=3250
x=3075
1. Tìm 2 số biết thương của số thứ nhất và số thứ hai là 6 và dư 8, hiệu của chúng là 97
2.Tìm x
a) (158-x):7=20
b)70-5.(x-3)=45
c)231-(x-6)=1339:13
Tìm số nguyên x, biết:
a) 4.x + 15 = -5;
b) (-270) : x - 20 = 70.
a) 4 . x + 15 = - 5
⇒ 4 . x = - 5 – 15
⇒ 4 . x = - 20
⇒ x = - 20 : 4
⇒ x = - 5.
Vậy x = - 5.
b) (- 270) : x – 20 = 70.
⇒ (- 270) : x = 70 + 20
⇒ (- 270) : x = 90
⇒ x = (- 270) : 90
⇒ x = - 3
Vậy x = - 3
2*X-138=8*9
231-(X-6)=1339:13
70-5*(X-3)=45
10+2*X=16
a) 2 * x - 138 = 8 * 9
2 * x - 138 = 72
2 * x = 210
x = 105
b) 231 - ( x - 6 ) = 1339 : 13
231 - x + 6 = 103
237 - x = 103
x = 134
c) 70 - 5 * ( x-3) = 45
5 * (x-3) = 25
x - 3 = 5
x = 8
cac phan con lai bn lm tuong tu nha
* 2*X-138=8*9
<=> 2*X-138=72
<=> 2*X=72+138
<=> 2*X=210
<=> X=210/2=105
*231-(X-6)=1339:13
<=> 231-(X-6)=103
<=> X-6=231-103
<=>X-6=128
<=>X=128+6=134
*70-5*(X-3)=45
<=>5*(X-3)=70-45
<=>5*(X-3)=25
<=>X-3=25/5
<=>X-3=5
<=>X=8
*10+2*X=16
<=>2*X=16-10
<=>2*X=6
<=>X=6/2=3
\(2x-138=72\)
\(2x=72+138\)
\(2x=210\)
\(x=105\)
\(231-\left(x-6\right)=1339:13\)\(231-\left(x-6\right)=103\)
\(x-6=231-103\)
\(x-6=128\)
\(x=134\)
\(70-5\left(x-3\right)=45\)\(5\left(x-3\right)=70-45\)
\(5\left(x-3\right)=25\)
\(x-3=5\)
\(x=5+3\)
\(x=8\)
\(10+2x=16\)\(2x=16-10\)
\(2x=6\)
\(x=3\)
(x – 15 ) – 75 = 0 b) 575- (6x +70) =445
c) x –105 : 21 =15 d) (x - 105) :21 = 15
a) \(\left(x-15\right)-75=0\\ \Leftrightarrow x-15=75\\ \Leftrightarrow x=90\)
b) \(575-\left(6x+70\right)=445\\ \Leftrightarrow6x+70=130\\ \Leftrightarrow6x=60\\ \Leftrightarrow x=10\)
c) \(x-105:21=15\\ \Leftrightarrow x-5=15\\ \Leftrightarrow x=20\)
d) \(\left(x-105\right):21=15\\ \Leftrightarrow x-105=315\\ \Leftrightarrow x=420\)
a) ( x - 15 ) - 75 = 0
x -15 = 75 + 0
x - 15 = 75
x= 75 + 15
x = 90
b) 575- (6x +70) =445
6x + 70 = 575 - 545
6x + 70 = 130
6x = 130 - 70
6x = 60
x = 60 : 6
x = 10
c) x –105 : 21 =15
x –105 = 15 x 21
x -105 = 315
x = 315 + 105
x = 420
d) (x - 105) :21 = 15
x - 105 = 21
x = 105 + 21
x = 126
a) (x - 5) - 75 = 0
x - 5 = 75 + 0
x - 5 = 75
x = 75 + 5
x = 80
b) 575 - (6x + 70) = 445
6x + 70 = 575 - 445
6x + 70 = 130
6x = 130 - 70
6x = 60
x = 60 : 6
x = 10
c) x - 105 : 21 = 15
x - 5 = 15
x = 15 + 5
x = 20
d) (x - 105) : 21 = 15
x - 105 = 15 x 21
x -150 = 135
x = 135 + 150
x = 285
Bài 10: Tìm số tự nhiên x, biết:
a) 70 – 5 . (x – 3) = 45 b) 2 . x – 138 = 2 ^3 . 3^ 2 c) 10 + 2 . x = 4 ^5 : 4 ^3d) 231-( x-6) = 1339: 13a,70 – 5.(x – 3) = 45
5.(x -3) = 70 - 45
5.(x – 3) = 25
x – 3 = 25 : 5
x – 3 = 5
x = 5 + 3
x = 8
Vậy x = 8
b,\(2x-138=8x9=72\)
\(2x=138+72=210\)
\(x=210:2=105\)
c,\(10+2x=4^2\)\(=16\)
\(2x=16-10=6\)
\(x=6:2=3\)
d, 231 – (x- 6) = 1339 : 13
231 – (x – 6) = 103
x – 6 = 231 – 103
x – 6 = 128
x = 128 + 6
x = 134
Vậy x = 134