Tim x biet :x-1/7+x-1/9+x-1/11+x-1/13=0
b) 315+(125-x) : 5=435 c) 315+(125-x)=435
Trả lời giúp mình gấp nhé
tìm x biết :
315+[125-x]=435
xin mn giúp t đang gấp
315+[125-x]=435
125-x=435-315
125-x=120
x=125-120
x=5
\(315+\left(125-x\right)=435\)
\(125-x=435-315\)
\(125-x=120\)
\(x=125-120\)
\(x=5\)
315 + [ 125-x ] = 435
125-x = 435 - 315
125-x = 120
x = 125-120
x = 5
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
bai 1:
a,1/6+1/20+1/30+1/42+1/56+1/72=?
tim x
b,575--[6x+70]=445
c,315+[125-x]=435
giai giup minh nhe^_^
b)575- [(-6)x+70]=445
-6x+70=575-445=130
-6x=130-70=60
x= 60:(-6)
x=-10
Vậy x=-10
c)
315+(125-x)=435
125-x= 435-315= 120
x=125-120
x=5
Vậy x= 5
tìm xEN biết :
a) ( x - 15 ) - 75 = 0
b) 575 - ( 6x + 70 ) = 445
c) 315 + ( 125 - x ) = 435
giúp mk nhé mn ơi
a) ( x - 15 ) - 75 = 0
<=> x - 15 = 75
<=> x = 90
b) 575 - ( 6x + 70 ) = 445
<=> 6x + 70 = 130
<=> 6x = 60
<=> x = 10
c) 315 + ( 125 - x ) = 435
<=> 125 - x = 120
<=> x = 5
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
c, 315 + ( 125 - x ) = 435
125 - x = 435 - 315
125 - x = 120
x = 125 - 120
x = 5
Học tốt
(x-15)=0+75
(x-15)=75
x=75+15
x=90
vậy x=90
(6x+70)=575-445
(6x+70)=130
6x=130-70
6x=60
x=60:6
x=10
vậy x=10
(125-x)=435-315
(125-x)=120
x=125-120
x=5
vậy x=5
a, 315+(125-x)=435
b,5×(x-12)=120
c,(3x-7):2=28
a, 315+(125-x)=435
125-x=435-315
125-x=120
x=125-120=5
b, 5(x-12)=120
x-12=120:5
x-12=24
x=24+12=36
c, (3x-7):2=28
3x-7=28.2
3x-7=56
3x=56+7
3x=63
x=63:3=21
a, 215+(125-x)=435
=>125-x=435-315
=>125-x=120
=>x=125-120
=>x=5
b,5x(x-12)=120
=>x-12=120:5
=>x-12=24
=>x=24+12
=>x=36
c,(3x-7):2=28
=>3x-7=28x2
=>3x-7=56
=>3x=56+7
=>3x=63
=>x=63:3
=>x=21
a, 125-x =435-315=120
x=125-120=5
b, x-12=120:5=24
x=24+12=36
c, 3x-7=28x2=56
3x=56+7=63
x=63:3=21
tìm x biết
a,315+(125-x)=435
b,x:(111-99)=175
c,(509+355):x=840:35
các bạn giúp mình nhé!
a,315+(125-x)=435
125-x=435-315
125-x=120
x=125-120
x=5
a;315+(125-x)=435
125-x=435-315
125-x=120
x=125-120
x=5
b;x/(111-99)=175
x/12=175
x =175*12
Giải giúp nhé! aii nhanh mk tick
Tìm X
315 = ( 125 - x) = 435
Đầu bài phải là :315+(125-x)=435
kết quả là x=5
k cho mk nha
Tìm x,biết:
a, 315+(125-x)=435
b, 6x-5=613
c, 128-3(x+4)=23
d, [(14x +26).3+55].5=23
e, -x +8=17
f, 134-2{156-6[54-2(9+6)]}.x=86
Bạn nào làm nhanh mình tick nhé.
a, 315+(125-x)=435
<=> 125 - x = 435 - 315
<=> 125 - x = 120
<=> x = 5
b, 6x-5=613
<=> 6x = 613 + 5
<=> 6x = 618
<=> x = 103
c, 128-3(x+4)=23
<=> 3(x +4 ) = 105
<=> x + 4 = 35
<=> x = 31
e, -x +8=17
<=> x = -9
a, 315+(125-x)=435
125-x=435-315=120
x=125-120=5
=>x=5
b,6x-5=613
6x=613+5=618
x=618:6=103
c, 128-3(x+4)=23
3(x+4)=128-23=105
x-4=105:3=35
x=35+4=39
Ý D NHẦM ĐẦU BÀI BẠN ƠI.
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