tìm x
4057+(X : 38 ) = 20395. 3132 - 19832 : X= 3058
1260 : X x 215=7740. X x 125 + X X876 - X = 12000
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a ) 3885 / ( x * 21 ) = 37
x * 21 = 3885 : 37
x * 21 = 105
x = 105 : 21
x = 5
b ) 50343 : x = 405 ( dư 123 )
x = ( 50343 - 123 ) : 405
x = 50220 : 405
x = 124
c ) 3257 + 25286 : x = 3304
25286 : x = 3304 - 3257
25286 : x = 47
x = 25286 : 47
x = 538
a ) 3885 / ( x * 21 ) = 37
x * 21 = 3885 : 37
x * 21 = 105
x = 105 : 21
x = 5
b ) 50343 : x = 405 ( dư 123 )
x = ( 50343 - 123 ) : 405
x = 50220 : 405
x = 124
c ) 3257 + 25286 : x = 3304
25286 : x = 3304 - 3257
25286 : x = 47
x = 25286 : 47
x = 538
@_@ k mình nha
1260: x* 215=7740
1260: x =7740 : 215
1260 : x = 36
x = 1260: 36
x = 35.
\(\text{4057 + ( x : 38) = 20395}\)
\(\text{x : 38 = 20395 - 4057}\)
\(\text{x : 38 = 16338}\)
\(\text{x = 16338 x 38}\)
\(\text{x = 620844}\)
a) 2x + 25 = 145
\(\Rightarrow\)2x = 145 - 25
\(\Rightarrow\)2x = 120
\(\Rightarrow\)x = 60
b) 216 : x + 34 : x = 10
\(\Rightarrow\)( 216 + 34) : x = 10
\(\Rightarrow\)250 : x = 10
\(\Rightarrow\)x = 250 : 10
\(\Rightarrow\)x = 25
c) 2017 : x - 17 : x = 1000
\(\Rightarrow\)( 2017 - 17 ) : x = 1000
\(\Rightarrow\)2000 : x = 1000
\(\Rightarrow\)x = 2000 : 1000
\(\Rightarrow\)x = 2
d) 4057 + (2x : 38 ) = 20395
\(\Rightarrow\)2x : 38 = 20395 - 4057
\(\Rightarrow\)2x : 38 = 16338
\(\Rightarrow\)2x = 16338 . 38
\(\Rightarrow\)2x = 620844
\(\Rightarrow\)x = 620844 : 2
\(\Rightarrow\)x = 310422
e) ( x + 1 ) + ( x + 4 ) + ( x + 7 ) + ... + ( x + 28 ) = 155 ( có 10 số hạng x )
\(\Rightarrow\)x + 1 + x + 4 + x + 7 + ... + x + 28 = 155
\(\Rightarrow\)10x + ( 1 + 4 + 7 + ... + 28 ) = 155
\(\Rightarrow\)10x + 145 = 155
\(\Rightarrow\)10x = 155 - 145
\(\Rightarrow\)10x = 10
\(\Rightarrow\)x = 1
Bài làm :
1) x/7 < 12/35
=> x < 12/5 (Nhân 7 vào cả 2 vế)
2) x/13 + 15/26 = 46/52
<=> x/13 = 46/52 - 15/26 = 4/13
<=> x = 4
3) x/27-2/9=6/18
<=> x/27 = 6/18+2/9 = 5/9
<=> x = 5/9 x 27 = 15
4) 3132 - 19832 : x = 3058
<=> 19832 : x = 3132 - 3058 = 74
<=> x=19832:74=268
75 x (x + 157) = 24450
x + 157 = 24450 : 75
x = 326 - 157
x = 169
14700 : (x + 47) = 84
x + 47 = 14700 : 84
x = 175 - 47
x = 128
69 x (x - 157) = 18837
x - 157 = 18837 : 69
x = 273 + 157
x = 430
41846 : (x - 384) = 98
x - 384 = 41846 : 98
x = 427 + 384
x = 811
7649 + X x 54 = 33137
X x 54 = 33137 - 7649
x = 25488 : 54
x = 472
35320 - X x 72 = 13072
X x 72 = 35320 - 13072
x = 22248 : 72
x = 309
4057 + (x : 38) = 20395
x : 38 = 20395 - 4057
x = 16338 x 38
x = 620844
21683 - (x : 47) = 4857
x : 47 = 21683 - 4857
x = 16826 x 47
x = 790822
4057+(X:38) = 20395
X:38 = 20395-4057
X:38= 16338
X=16338 x 38
X= 620844