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a, X x 186-Z x 86=3400
X x (186-86) =3400
X x 100=3400
X= 3400: 100
X= 34
b, X x 75+57 x X =32604
X x (75+57)=32604
X x 132=32604
X= 32604 : 132
X = 247
c, 216: X +34: X =10
(216+34) : X=10
250 : X =10
X= 250:10
X= 25
d, 2125:X -125 :X=100
(2125-125) :X= 100
2000: X=100
X= 2000:100
X= 20
a) \(x\times186-x\times86=3400\)
\(x\times\left(186-86\right)=3400\)
\(x\times100=3400\)
\(x=3400:100\)
\(x=34\)
b) \(x\times75+57\times x=32604\)
\(x\times\left(75+57\right)=32604\)
\(x\times132=32604\)
\(x=32604:132\)
\(x=247\)
c) 216 : x + 34 : x = 10
(216 + 34) : x = 10
250 : x = 10
x = 250 : 10
x = 25
d) 2125 : x - 125 : x = 100
(2125 - 125) : x = 100
2000 : x = 100
x = 2000 : 100
x = 20
![](https://rs.olm.vn/images/avt/0.png?1311)
a)X x 62 + X x 38 = 4200 b) X x 186 - X x 86 = 3400
X x 62 + 38 =4200 X x 186 - 86 = 3400
X x 100 = 4200 X x 100 = 3400
X = 4200 : 100 X = 3400 : 100
X = 42 X = 34
c)X x 623 - X x 123 = 1000
X x 623 - 123 = 1000
X x 500 = 1000
X = 1000 : 500
X = 2
![](https://rs.olm.vn/images/avt/0.png?1311)
a) 1400 : 20 - (17 + x) = 20
70 - (17 + x) = 20
17 + x = 70 - 20
17 + x = 50
x = 50 - 17
x = 33
b) 8 \(\times\) (x + 15) = 640
x + 15 = 640 : 8
x + 15 = 80
x = 80 - 15
x = 65
c) x \(\times\) 62 + x \(\times\) 38 = 4200
x \(\times\) (62 + 38) = 4200
x \(\times\) 100 = 4200
x = 4200 : 100
x = 42
d) x \(\times\) 186 - x \(\times\) 86 = 3400
x \(\times\) (186 - 86) = 3400
x \(\times\) 100 = 3400
x = 3400 : 100
x = 34
![](https://rs.olm.vn/images/avt/0.png?1311)
a (X:10)+37=60
X:10=23
X=2,3
b 25xX-15xX=72
X(x25-15)=72
Xx10=72
X=7,2
c 138-(Xx5)=38
Xx5=100
X=20
d (Xx9):52=18
Xx9=936
X=104
e 52xX+48xX=100
Xx(52+48)=100
Xx100=100
X=1
f 623xX-123xX=1000
Xx(623-123)=1000
Xx500=1000
X=2
g Xx16+84xX=700
Xx(16+84)=700
Xx100=700
X=7
h 236xX-Xx36=2000
Xx(236-26)=2000
Xx200=2000
X=10
i 216:X+34:X=10
(216+34):X=10
250:X=10
X=25
f 2125:X-125:X=100
(2125-125):X=100
2000:X=100
X=20
![](https://rs.olm.vn/images/avt/0.png?1311)
`@Khóii`
\(x × ( 75 + 57 ) = 32604\)
\(x × 132 = 32604\)
\(x = 32604 : 132\)
\(x = 247\)
x * 75 + 57 * x = 32604
x * (75 + 57) = 32604
x * 132 = 32604
x = 32604 : 132 = 247
a/ 34
b/ 247
c/ 25
d/ 20
T.I.C.K cho mình nha
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