(x – 15 ) – 75 = 0 b) 575- (6x +70) =445
c) x –105 : 21 =15 d) (x - 105) :21 = 15
a/(x-15)-75=0
b/575-(6x+70)=445
c/315+(125-x)=435
d/x-105:21=15
e/(x-105):21=1
a) ( x - 15 ) - 75 = 0
x - 15 = 75
x = 75 + 15
x = 90
Vậy x = 90
b) 575 - ( 6x + 70 ) = 445
6x + 70 = 575 - 445
6x + 70 = 130
6x = 60
x = 10
Vậy x = 10
c) 315 + ( 125 - x ) = 435
125 - x = 120
x = 125 - 120
x = 5
Vậy x = 5
d) x - 105 : 21 = 15
x - 5 = 15
x = 20
Vậy x = 20
e) ( x - 105 ) : 21 = 1
x - 105 = 21
x = 21 + 105
x = 126
Vậy x = 126
a) (x-15)-75=0
x-15 = 0+75
x-15 = 75
x = 75 + 15
x = 90
b) 575-(6x+70)=445
6x+70 = 575-445
6x+70 = 130
6x = 130 - 70
6x = 60
x = 60:6
x = 10
d) x-105:21 = 15
x-105 = 15.21
x-105 = 315
x = 315 + 105
x = 420
e) (x-105):21 = 1
=> x-105 = 21
x = 105 + 21
x = 126
Tìm x:
a) ( x - 15 ) - 75 = 0 c) 315 + ( 125 - x ) = 435
x - 15 = 75 + 0 125 - x = 435 - 315
x - 15 = 75 125 - x = 120
x = 75 + 15 x = 125 - 120
x = 90 x = 5
b) 575 - ( 6x + 70 ) = 445 d) x - 105 : 21 = 15
6x + 70 = 575 - 445 x - 105 = 15 x 21
6x + 70 = 130 x - 105 = 315
6x = 130 - 70 x = 315 + 105
6x = 60 x = 420
x = 60 : 6
x = 10
Tìm x
a) ( x - 15 ) - 15 = 0
b) 575 - ( 6x + 70 ) = 445
c) 315 + ( 125 - x ) = 435
d) x - 105 : 21 = 15
a ) ( x - 15 ) - 15 = 0
x - 15 = 15
x = 15 + 15
x = 30
a ) ( x - 15 ) - 15 = 0
x - 15 = 0 + 15
x - 15 = 15
2,6 x X - 5= 613
[ X -15 ] -75=0
575- [6 x X +70 ] =445
315+ [125 -X ] = 435
X- 105 : 21 =15
[ X - 105 ] : 21=15
Tìm x thuộc N biết :
a) (x-15)x15=0
b) 32(x-10)=32
c)315 (125-x)=435
d) (x-15)-75=0
e) 575-(6x 70)=445
g)x-105:21=15'
câu d mk làm sai rồi
d) (x-15)-75=0
x-15=0+75=75
x=75+15=90
a) (x-15)x15=0
=>x-15=0
x=0+15=15
b) 32(x-10)=32
x-10=32:32=1
x=1+10=11
c)315 (125-x)=435
125-x=435-315=120
x=125-120=5
d) (x-15)-75=0
=>x-15=0
x=0+15=0
e) 575-(6x 70)=445
6x70=575-445=130
6x=130:70=13/7
x=13/7:6=13/42
g)x-105:21=15'
x-5=15
x=15+5=20
**** nhé
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
Bài 7. Tìm x ϵ N biết:
a) (x – 15 ) – 75 = 0
b) 575- (6x +70) =445
c) x –105 : 21 =15
d) (x - 105) :21 = 15
giải đầy đủ giúp mik với
Bài 7:
a)(x-15)-75=0
⇔x-15=75
⇔x=90
b)575-(6x+70)=445
⇔6x+70=130
⇔6x=60
⇔x=10
c)x-105:21=15
⇔x-5=15
⇔x=20
d)(x-105):21=15
⇔x-105=315
⇔x=420
bài 2 tìm x
1 ( x - 17 ) * 17 = 0
2 32 ( x - 11 ) = 32
3 ( x - 25 ) - 75 = 0
4 575 -( 6 * x + 70 ) = 445
5 315 + ( 125 - x ) = 435
6 x- 105 : 21 = 15
7 ( x - 105 ) : 21 = 15
8 ( x - 38 ) : 19 = 12
9 ( x - 15 ) * ( x - 19 ) = 0
10 96 - 3 ( x + 1 ) = 42
1) (x-17)*17=0
x-17=0
x=17
2) 32(x-11)=32
x-11=1
x=12
3) (x-25)-75=0
x-25=75
x=3
4) 575-(6*x+70)=445
6*x+70=130
6*x=60
x=10
5) 315+(125-x)=435
125-x=120
x=5
6) x-105:21=15
x-5=15
x=20
7) (x-105):21=15
x-105=315
x=420
8) (x-38):19=12
x-38=228
x=266
9) (x-15)*(x-19)=0
=>x-15=0 hoặc x-19=0
x=15 hoặc x=19
10) 96-3(x+1)=42
3(x+1)=54
x+1=18
x=17
a) ( x - 17 ) . 17 = 0
=> x - 17 = 0 : 17
=> x - 17 = 0
=> x = 0 + 17
=> x = 17
b) 32 . ( x - 11 ) = 32
=> x - 11 = 32 : 32
=> x - 11 = 1
=> x = 1 + 11
=> x = 12
c) ( x - 25 ) - 75 = 0
=> x - 25 = 0 + 75
=> x - 25 = 75
=> x = 75 + 25
=> x = 100
d) 575 - ( 6 . x + 70 ) = 445
=> 6 . x + 70 = 575 - 445
=> 6 . x + 70 = 130
=> 6 . x = 130 - 70
=> 6 . x = 60
=> x = 60 : 6
=> x = 10
e) 315 + ( 125 - x ) = 435
=> 125 - x = 435 - 315
=> 125 - x = 120
=> x = 125 - 120
=> x = 5
f) x - 105 : 21 = 15
=> x - 5 = 15
=> x = 15 + 5
=> x = 20
g) ( x - 105 ) : 21 = 15
=> x -105 = 15 . 21
=> x - 105 = 315
=> x = 315 + 105
=> x = 420
h) ( x - 38 ) : 19 = 12
=> x - 38 = 12 . 19
=> x - 38 = 228
=> x = 228 + 38
=> x = 266
i) ( x - 15 ) . ( x - 19 ) = 0
=> x - 15 = 0 => x = 0 + 15 => x = 15
x - 19 = 0 => x = 0 + 19 = x = 19
=> x = 15 ; 19
j) 96 - 3( x + 1 ) = 42
=> 3( x + 1 ) = 96 - 42
=> 3( x + 1 ) = 54
=> x + 1 = 54 : 3
=> x + 1 = 18
=> x = 18 - 1
=> x = 17
Tìm x
a,575-(6x+70)=447
b,x-105:21=15
c,(x-5).(x-7)=0
d,(x-36):18=12
e,32.(x-10)=32
Làm nhanh nha mn:
a)(x-13)-17=0
b)315+(125-x)=435
c)575-(6x+70)=445
d)(x-105):21=15
e)102-3.(x+1)=27
a)(x-13)-17=0
=>X-13. = 0+17
=>x-13. =17
=>x. = 17+13
=>x. = 30
b)315+(125-x)=435
=>(125-x). =435-315
=>(125-x). =120
=>.x. = 5
c)575-(6x+70)=445
=>(6x+70). =575-445
=> (6x+70). =130
=>. 6x. =130-70
=>6x. =60
=>x. =60:6
=>X. =10
a) (x-13)-17=0 (x-13) =0+17 x-13 =17 x = 17+13 x =30
d)(x-105):21=15
=>(X-105). =15.21
=>(x-105). =315
=>x. = 315+105
=>x. =420
e)102-3.(x+1)=27
=> 3.(x+1.) =102-27
=>3.(x+1) =75
=>x+1. =75:3
=>x+1. =25
=> x. = 25-1
x. =24