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Ta có : 107x - 7x = 3 200
=> (107 - 7)x = 3 200
=> 100x = 3 200
=> x = 3 200 : 100 = 32
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![](https://rs.olm.vn/images/avt/0.png?1311)
( x + 1 ) + ( x + 3 ) + ( x + 7 ) + ( x + 11 ) + .......... + ( x + 31 ) + ( x + 33 ) = 306
( x + x + x + x + ......... + x + x ) + ( 1 + 3 + 7 + 11 + .......... + 31 + 33) = 306
\(\Rightarrow\) 17x + 289 = 306
17x = 306 - 289
17x = 17
x = 17 : 17
x = 1
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a) \(x=1000002;1000003;...;9999999\)
b) \(x=9999999\)
c) \(x=1000001;1000002\)
@#$%^&* !
a) x = 1 000 002
b) x = 9 999 999
c) x = 1 000 001 ; 1 000 002
k mik nha
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Tìm x :
x + 1/3 = 4/5
x = 4/5 - 1/3
x = 12/15 - 5/15
x = 7/15
x - 1/2 = 2/7
x = 2/7 + 1/2
x = 4/14 + 7/14
x = 11/14
4/7 × x = 1/3
x = 1/3 : 4/7
x = 1/3 × 7/4
x = 7/12
x : 2/5 = 2/9
x = 2/9 × 2/5
x = 4/45
20 × 7 : ( 5 × x - 3 × 5 ) = 4
140 : 5 × ( x - 3 ) = 4
5 × ( x - 3 ) = 140 : 4
5 × ( x - 3 ) = 35
x - 3 = 35 : 5
x - 3 = 7
x = 7 + 3
x = 10
x - 270 = 420 : 105
x - 270 = 4
x = 4 + 270
x = 274
x - 140 : 35 = 270
x - 4 = 270
x = 270 + 4
x = 274
x + 1/3 = 4/5
x = 4/5 - 1/3
x = 7/15
x - 1/2 = 2/7
x = 2/7 + 1/2
x = 11/14
4/7 * x = 1/3
x = 1/3 : 4/7
x = 7/12
x : 2/5 = 2/9
x = 2/9 * 2/5
x 4 / 45
20 * 7 : ( 5*x - 3 * 5) =4
= 140 :(5*x -3 *5) =4
5*x- 3*5 = 140 : 4
5*x - 3 * 5 = 35
5* x = 35 + 3 * 5
5 * x = 50
x = 50 : 5
x = 10
x - 270 = 402 : 105
x - 270 = 4
x = 270 + 4
x = 274
x- 140 : 35 = 270
x - 4 = 270
x = 270 + 4
x = 274
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a) 7 x 50 x 20 = 7 x (50 x 20) = 7 x 1 000 = 7 000
b) 40 x 3 x 50 = (40 x 50) x 3= 2 000 x 3 = 6 000
c) 80 x 1 000 x 4 = 80 000 x 4 = 320 000
d) 3 x 60 x 500 = 3 x (60 x 500) = 3 x 30 000 = 90 000