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(627 - 138) : (x : 2) = 163 =>>> 489 : (x : 2) = 163 =>>>>>>x : 2 = 489 : 163 =3
=>>>>>>>>>>x = 3 . 2 = 6 . Vậy x=6 .......k nha
(627 - 138) : (X : 2) = 163
489 : (X : 2) = 163
(X : 2) = 489 : 163
X : 2 = 3
X = 3 x 2
X = 6
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bài 1 :
a, x - 140 : 35 = 270
x - 4 = 270
x = 270 + 4
x = 274
b, 180 - ( x - 45 ) : 2 = 120
( x - 45 ) : 2 = 180 - 120 = 60
x - 45 = 60 . 2 = 120
x = 120 + 45 = 165
c, x : 15 + 42 = 15 + 25 . 8
x : 15 + 42 = 15 + 200
x : 15 + 42 = 215
x : 15 = 215 - 42 = 173
x = 173 . 15 = 2595
d, ( x + 40 ) . 15 = 75 . 12 = 900
x + 40 = 900 : 15 = 60
x = 60 - 40 = 20
e, 1,2x - 4,68 : 1,3 : 1,2 = 0,6
1,2x - 3 = 0,6
1,2x = 0,6 + 3 = 3,6
x = 3,6 : 1,2 = 3
g, 2,4 : ( 2 - x ) - 0,32 x 4,5 = 1,56
2,4 : ( 2 - x ) - 1,44 = 1,56
2,4 : ( 2 - x ) = 1,56 + 1,44 = 3
2 -x = 2,4 : 3 = 0,8
x = 2 - 0,8 = 1,2
h) 3/4 - ( x - 1 ) = 1/2
3/4 - x + 1 = 1/2
3/4 - x = 1/2 + 1 = 3/2
x = 3/4 - 3/2 = -3/4
k) 5/3 - ( 3x + 0,5 ) = 2/3
3x + 0,5 = 5/3 - 2/3 = 1
3x = 1 - 0,5 = 0,5
x = 0,5 : 3 = 1/6
mỏi tay qá
![](https://rs.olm.vn/images/avt/0.png?1311)
\(\left(627-138\right):\left(3x:2\right)=163\)
\(\Leftrightarrow489:\left(3x:2\right)=163\)
\(\Leftrightarrow3x:2=3\)
\(\Leftrightarrow3x=6\)
\(\Leftrightarrow x=2\)
~~~~~~~~~~~ai đi ngang qua nhớ để lại k ~~~~~~~~~~~~~
~~~~~~~~~~~~ Chúc bạn sớm kiếm được nhiều điểm hỏi đáp ~~~~~~~~~~~~~~~~~~~
( 627 - 138 ) : ( 3x : 2 ) = 163
489 : ( 3x : 2 ) = 163
3x : 2 = 3
3x = 6
=> x = 2
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta có:
B. ( x - 21.13 ) : 11 = 30
=> x = 30 x 11 + 21 x 13
=> x = 330 + 273
=> x = 603
C. ( 25 - x ) + ( 29 - x ) + ( 33 - x ) + ... + ( 101 - x ) = 128
=> ( 25 + 29 + 33 + ... + 101 ) - ( x + x + x +...+ x ) = 128
=> 1260 - 20x = 128
=> 20x = 1260 - 128
=> x = 1132 : 20
=> x = 283/5
B. ( x - 21.13 ) : 11 = 30
=> x = 30 x 11 + 21 x 13
=> x = 330 + 273
=> x = 603
C. ( 25 - x ) + ( 29 - x ) + ( 33 - x ) + ... + ( 101 - x ) = 128
=> ( 25 + 29 + 33 + ... + 101 ) - ( x + x + x +...+ x ) = 128
=> 1260 - 20x = 128
=> 20x = 1260 - 128
=> x = 1132 : 20
=> x = 283/5
![](https://rs.olm.vn/images/avt/0.png?1311)
`(2/(11.13)+2/(13.15)+....+2/(19.21)).462-[0,04/(x+1,05):0,12=19`
`=>(1/11-1/13+1/13-1/15+....+1/19-1/21).462-(2/(50(x+1,05)).25/3=19`
`=>(1/11-1/21).462-1/(3(x+1,05))=19`
`=>10/231. 462-1/(3x+3,15)=19`
`=>20-1/(3x+3,15)=19
`=>1/(3x+3,15)=1`
`=>3x+3,15=1`
`=>3x=-2,15`
`=>x=-43/60`
Vậy `x=-43/60`
![](https://rs.olm.vn/images/avt/0.png?1311)
1a) 25 .8 - 12.5 + 272 :17 - 8
= 200 - 60 + 16 - 8
= 140+16-8
= 156 - 8
= 148
b) 125: 25 +14 - 142 : 71
= 5 + 14 - 2
= 19 - 2 = 17
c) 13. 17 - 256: 16 + 14 : 7 - 1
= 221 - 16 + 2 - 1
= 205 + 2 - 1
= 207 - 1 = 206
d) 15 . 24 - 14 . 5 (145 : 5 - 27)
= 360 - 70 (29- 27)
= 360 - 70 . 2
= 360 - 140
= 220
2a) 37 + x = 55
x= 55 - 37
x = 18
b) x- 31 = 24
x = 24 + 31
x = 55
c) 21 (x-11) = 21
x - 11 = 21 : 21
x = 1 +11
x = 12
d ) 9. (x - 29)= 0
x - 29 = 0 :9
x = 29
e) (x - 1954) . 5 = 50
x - 1954 = 50 : 5
x = 1964
f ) 30 . 60 - x = 30
1800 - x = 30
x = 1800 - 30
x = 1770
Viết mỏi tay quá huhuh
a, \(\left(x-21\times13\right):11=30\)
\(\Rightarrow x-273=30\times11=330\)
\(\Rightarrow x=330+273=603\)
b, \(\left(627-138\right):\left(x:2\right)=163\)
\(\Rightarrow489:\left(x:2\right)=163\)
\(\Rightarrow x:2=489:163=3\Rightarrow x=2\times3=6\)
a, ( x - 21 . 13 ) : 11 = 30
( x - 273 ) = 30 . 11
x - 273 = 330
x = 330 + 273
x = 603
Vậy x = 603
b, ( 627 - 138 ) : ( x : 2 ) = 163
489 : ( x : 2 ) = 163
x : 2 = 489 : 163
x : 2 = 3
x = 3 . 2
x = 6
Vậy x = 6