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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
![](https://rs.olm.vn/images/avt/0.png?1311)
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
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
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
![](https://rs.olm.vn/images/avt/0.png?1311)
1.53x201=10653
2.
a)4 xX-15x4=6x15+X
<=>4x-60=90+x
<=>4x-x=60+90
<=>3x=150
<=>x=50
b(102+28-2x):20-5=1
<=>(130-2x):20=6
<=>130-2x=120
<=>2x=10
<=>x=5
c)1999x-x=1999+1997+1999
<=>1998x=5995
<=>\(x\approx3\)
d)105-5x=150:15
<=>105-5x=10
<=>5x=95
<=>x=19
e)(x+1)+(x+2)+(x+3)+...+(x+6)=78
<=>6x+21=78
<=>6x=57
<=>x=9,5
1) 53x201=53x200+53=10600+53=10653
2a)
4x-15x4=6x15+x
4x-60=90+x
4x-x=90+60
3x=150
x=50
b) x=5
c) x=3
d)x=19
e) x=9,5
![](https://rs.olm.vn/images/avt/0.png?1311)
x * 1999 = 1999* 1997 + 1999
x * 1999 = 1999 * 1998
Từ đây ta suy ra x = 1998
x.1999 - x = 1999.1997 + 1999
x.(1999 - 1) = 1999.(1997 + 1)
x.1998 = 1999.1998
=> x = 1999
Vậy x = 1999
Ủng hộ mk nha ☆_☆^_-
![](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)
X . 1999 - x = 1999 x 1997 + 1999
X . 1999 - X x 1 = 1999 x 1997 + 1999 x 1
X . 1997 = 1999 x 1998
X . 1997 = 3994002
X = 3994002 : 1997
X = 1997001
x . 1999 - x = 1999 . 1997 + 1999
=> x.(1999 - 1) = 1999.(1997 + 1)
=> x.1998 = 1999.1998
=> x = 1999
vậy x = 1999
Dấu . là nhân nha
a , x = 501
b , x = 1999
a) 5 * x - 1952 = 2500 - 1947
5 * x -1952 =553
5 * x = 553 + 1952
5 * x =2505
x = 501
b)x * 1999 - x = 1999*1997 +1999
x * ( 1999 -1) = 1999*(1997 +1)
x * 1998 =1999 * 1998
x =1999