tìm x
a, (5x-35)-120=0
b, 175:x, 250:x, và xen x=10
Bài 6. Tìm x ϵ N biết
a) (x –15) .15 = 0
b) 32 (x –10 ) = 32
c) ( x – 5)(x – 7) = 0
d) (x – 35).35 = 35
a, x=15
b, x=11
c, x=7
d, x=36
Bài 6:
a)(x-15).15=0
⇔x-15=0
⇔x=15
b)32(x-10)=32
⇔x-10=1
⇔x=11
c)(x-5)(x-7)=0
⇔x-5=0 hay x-7=0
⇔x=5 hay x=7
d)(x-35)35=35
⇔x-35=1
⇔x=36
a, x = 15
b, x = 11
c, x = 7 hoặc x = 5
d, x = 36
bài 5:tìm x biết
a)400-5x=200 b)250:x+10=20
c)96-3(x+8)=42 d)36:(x-5)=2^2
e)15.5(x-35)-525=0 f)[3.(70-x)+5]:2=46
giúp mình vs
a) 400 - 5x = 200
5x = 200
x = 40
b) 250 : x + 10 = 20
250 : x = 10
x = 25
c) 96 - 3 ( x + 8 ) = 42
3 ( x + 8 ) = 54
( x + 8 ) = 54 : 3
x + 8 = 18
x = 18 - 8
x = 10
d) 36 : ( x - 5 ) = 22
36 : ( x - 5 ) = 4
x - 5 = 36 : 4
x - 5 = 9
x = 9 + 5
x = 14
e) 15 x 5 ( x - 35 ) - 525 = 0
75 ( x - 35 ) - 525 = 0
75 ( x - 35 ) = 525
x - 35 = 7
x = 7 + 35
x = 42
f) [ 3 x ( 70 - x ) + 5 ] : 2 = 46
[ 3 x ( 70 - x ) + 5 ] = 92
3 x ( 70 - x ) = 87
70 - x = 87 : 3
70 - x = 29
x = 41
a)5x=400-200 b)250:x=20-10 c)96-3(x+8)=42
5x=200 250:x=10 3(x+8)=96-42
x=200:5 x=250:10 3(x+8)=54
x=40 x=25 x+8=54:3
Vậy x = 40 Vậy x = 25 x+8=18
d)36:(x-5)=4 e)15.5(x-35)-525=0+525 x=18-8 15.5(x-35)=525 x=10
x-5=9 5(x-35)=525:15 x=9-5=4 5(x-35)=35 Vậy x=10
Vậy x = 4 x-35=35:5 f){3.(70-x)+5}=46.2
x-35=7 {3.(70-x)+5}=92
x=7+35 3.(70-x)=92-5
x=42 3.(70-x)=87
Vậy x=42 70-x=87:3
70-x=29
x=70-29
x=41
Vậy x= 41
giúp mình với mn ơi :
tìm x thuộc N biết :
a) x -120 :30 =40
b (x-120) :35 = 5
c) (x + 100) . 4 =800
d) x.5 +10 .9 = 990
e) x.14 -x.2 =120
f)x.13 -x.10 = 240
g) 28.x -x.17-x=250
ai đúng m sẽ tick nha !!!
\(x-120:30=40\)
\(x-120=40.30=1200\)
\(x=1200+120=1320\)
Vậy. \(x=1320\)
a) x - 120 : 30 = 40
x - 4 = 40
x = 40 + 4
x = 44
b) (x - 120) : 35 = 5
x - 120 = 5.35
x - 120 = 175
x = 175 + 120
x = 295
c) (x + 100).4 = 800
x + 100 = 800 : 4
x + 100 = 200
x = 200 - 100
x = 100
d) x.5 + 10.9 = 990
5x + 90 = 990
5x = 990 - 90
5x = 900
x = 900 : 5
x = 180
e) x.14 - x.2 = 120
14x - 2x = 120
12x = 120
x = 120 : 12
x = 10
f) x.13 - x.10 = 240
13x - 10x = 240
3x = 240
x = 240 : 3
x = 80
g) 28.x - 17.x - x = 250
10x = 250
x = 250 : 10
x = 25
\(a.x-120:30=40\)
\(x-120=40.30\)
\(x-120=1200\)
\(x=1200+120\)
\(\Rightarrow x=1320\)
\(b.\left(x-120\right):35=5\)
\(\left(x-120\right)=5.35\)
\(x-120=175\)
\(\Rightarrow x=295\)
\(c.\left(x+100\right).4=800\)
\(\left(x+100\right)=800:4\)
\(x+100=200\)
\(x=200-100\)
\(\Rightarrow x=100\)
\(d.x.5+10.9=990\)
\(x.5+90=990\)
\(x.5=990-90\)
\(x.5=900\)
\(x=900:5\)
\(\Rightarrow x=180\)
\(e.x.14-x.10=240\)
\(x\left(14-10\right)=240\)
\(x.4=240\)
\(x=240:4\)
\(\Rightarrow x=60\)
Chúc bạn học tốt!
Bài 6. Tìm x ϵ N biết
a) (x –15) .15 = 0
b) 32 (x –10 ) = 32
c) ( x – 5)(x – 7) = 0
d) (x – 35).35 = 35
các bạn làm đầy đủ giúp mik với
Bài 6:
a)(x-15).15=0
⇔x-15=0
⇔x=15
b)32(x-10)=32
⇔x-10=1
⇔x=11
c)(x-5)(x-7)=0
⇔x-5=0 hay x-7=0
⇔x=5 hay x=7
d)(x-35)35=35
⇔x-35=1
⇔x=36
Tìm x, biết:
a) x.14 - x.2 = 120;
b) x. 13 - x.10 = 240
c) 28.x - x.17 - x = 250.
Tìm x, biết:
a) x.14 - x.2 = 120;
d) x. 13 - x.10 = 240
c) 28.x - x.17 - x = 250
a) Tìm x biết : x^3 -4x^2+5x-20>0
b) Biết 3x2 -3xy-5x+5y =0 và x≠ 𝑦 Tính giá trị S = x2 -x
\(a,\Leftrightarrow\left(x-4\right)\left(x^2+5\right)>0\\ \Leftrightarrow x-4>0\left(x^2+5\ge5>0\right)\\ \Leftrightarrow x>4\\ b,\Leftrightarrow\left(x-y\right)\left(3x-5\right)=0\\ \Leftrightarrow\left[{}\begin{matrix}x=y\left(vô.lí.do.x\ne y\right)\\x=\dfrac{5}{3}\left(tm\right)\end{matrix}\right.\\ \Leftrightarrow S=x^2-x=\dfrac{25}{9}-\dfrac{5}{3}=\dfrac{10}{9}\)
4. (x-250):6=43- 22x3
5.2x+3x+5x=1030
6.15x-35x+50x=120
7.1/2x+1/6x+1/3x=2023
8. 165-(35:x+3)x19= 13
cứu mình với,mình cần gấp
4. ( x - 250 ) : 6 = 64 - 12
( x- 250 ) : 6 = 52
x - 250 = 312
x = 562
5. 10x = 1030
=> x = 103
6. 30x = 120
x = 4
7. \(x=2023\)
\(8.165-\left(35:x+3\right).19=13\)
\(\left(35:x+3\right).19=152\)
\(35:x+3=8\)
\(35:x=5\)
\(x=7\)
4) \(\left(x-250\right)\div6=4^3-2^2\times3\)
\(\left(x-250\right)\div6=64-4\times3\)
\(\left(x-250\right)\div6=64-12=52\)
\(x-250=52\times6=312\)
\(x=312+250\)
\(x=562\)
5) \(2x+3x+5x=1030\)
\(x\left(2+3+5\right)=1030\)
\(10x=1030\)
\(x=1030\div10\)
\(x=103\)
6) \(15x-35x+50x=120\)
\(x\left(15-35+50\right)=120\)
\(30x=120\)
\(x=120\div30\)
\(x=4\)
7) \(\dfrac{1}{2}x+\dfrac{1}{6}x+\dfrac{1}{3}x=2023\)
\(x\left(\dfrac{1}{2}+\dfrac{1}{3}+\dfrac{1}{6}\right)=2023\)
\(x\times1=2023\)
\(x=2023\)
8) \(165-\left(35\div x+3\right)\times19=13\)
\(\left(35\div x+3\right)\times19=165-13\)
\(\left(35\div x+3\right)\times19=152\)
\(35\div x+3=152\div19=8\)
\(35\div x=8-3=5\)
\(x=35\div5\)
\(x=7\)
Tìm số tự nhiên x biết:
a) x : 1800 + 600 : 30 = 560 : 315 - 35
b) 250 - 25 : 15 : x = 450 - 60 : 130
c) 6 x - 72 : 2 - 84 . 28 = 5628
d) 5 x + x - 6 = 12