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X x 1999 - x = 1999 x 1997 + 1999
X x (1999 - 1) = 1999 x (1997 + 1)
X x 1998 = 1999 x 1998
Vậy x = 1999
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a) 210 : x = 14,92 - 6,52
210 : x = 8,4
x = 210 : 8,4
x = 25
Vậy x = 25
a, 210 : x = 8,4
x = 210 : 8,4
x = 25
b, 5 x X - 1952 = 2500 - 1947
5 x X - 1952 = 553
5 x X = 553 + 1952
5 x X = 2505
X = 2505 : 5
X = 501
c, X x 1999 - x = 1999 x 1997b + 1999
X x 1998 = 1999 x 1997b + 1999
Mình hơi bí câu này, thông cảm
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![](https://rs.olm.vn/images/avt/0.png?1311)
X * 1999 - x = 1999 x 1997 + 1999
X * 1998 = 1999 x 1998
=> x = 1999
![](https://rs.olm.vn/images/avt/0.png?1311)
\(a.\left(x\times0,25+1999\right)\times2000=2052\times2000\\ \left(x\times0,25+1999\right)\times2000=4104000\\ x\times0,25+1999=4104000:2000\\ x\times0,25+1999=2052\\ x\times0,25=2052-1999\\ x\times0,25=53\\ x=53:0,25\\ x=212\)
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X.1999.X=1999.1997+1999
X.1999.X=1999.1997+1999.1
X.X.1999=1999.(1997+1)
X.X.1999=1999.1998
X.X=1999.1998:1999=1998
X × 1999 × X = 1999 × 1997 + 1999
X^2 x 1999 = 1999 × 1997 + 1999 x 1
X^2 x 1999 = 1999 x ( 1997 + 1 )
X^2 x 1999 = 1999 x 1998
X^2 = 1999 x 1998 : 1999
X^2 = 1999 : 1999 x 1998
X^2 = 1 x 1998
X^2 = 1998
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tham khẢO
( X x 0,25 + 1999) x 2000=( 53+1999) x 2000
( X x 0,25 + 1999) = ( 53+1999) x 2000 : 2000
( X x 0,25 + 1999) = ( 53+1999)
( X x 0,25 + 1999) = 2052
X x 0,25 = 2052 -1999
X x 0,25 = 53
X = 53 : 0,25
X = 212
![](https://rs.olm.vn/images/avt/0.png?1311)
Xx1999-X=1999x1977+1999
Xx1998=3992003+1999
Xx1998=3994002
X=1999
k minh nha
X=1999 nha bạn