tìm x:
25+55+x=130
Tìm x biết (x+1)+(x+1/3)+(x+1/6)+.......(x+1/55)=130/11
x+2/2+x+ 2/6 +x+ 2/12 +...+x+ 2/110 = 130/11
=> x +2/1.2 + x +2/2.3 + x +2/3.4 +...+ x +2/10.11 = 130/11
=> 10 x + 2/1.2+2/2.3+....+2/10.11 = 130/11
=> 10 x + 2. [ 1/1.2+1/2.3+...+1/10.11] = 130/11
=> 10 x + 2. [1-1/2+1/2-1/3+...+1/10-1/11] = 130/11
=> 10 x + 2 [1-1/11] = 130/11
=> 10 x + 2 x 10/11 = 130/11
=> 10 x +20/11 = 130/11
=> 10 x = 10 => x= 10 : 10=1
( x + 74 ) - 318 = 200
[ ( x - 29 ) - 11 ] : 2 = 8
3636 : ( 12x - 91 ) = 36
[ ( 250 - 25 ) : 15 ] : x = ( 450 - 60 ) : 130
[ ( 4x + 28 ) . 3 - 55 ] : 5 = 35
(x+74) - 318=200
x+74 =200+318
x+74 =518
x =518-74
x = 444
[ (x-29) - 11 ] : 2 = 8
[ (x-29) - 11 ] = 8x2
[ (x-29) - 11 ] = 16
x-29 = 16 + 11
x-29 = 27
x = 27 + 29
x = 56
3636 : (12x -91) =36
12x-91 =3636 : 36
12x-91 = 101
12x = 101 + 91
12x = 192
x = 192 : 12
x = 16
[ ( 250 - 25 ) : 15 ] : x = ( 450 - 60 ) : 130
[ 225 : 15 ] : x = 390 : 130
15 : x = 3
x = 15 : 3
x = 5
[ ( 4x + 28 ) . 3 - 55 ] : 5 = 35
[ ( 4x + 28 ) . 3 - 55 ] = 35 : 5
[ ( 4x + 28 ) . 3 - 55 ] = 7
( 4x + 28 ) . 3 = 7 + 55
( 4x + 28 ) . 3 = 62
( 4x + 28 ) = 62 : 3
SAI ĐỀ RỒI TÍNH KO RA
tìm x biết 130-3(x-4)=25
3.(x-4)= 130 - 25
3.(x-4)=105
x-4 = 105:3
x-4= 35
x= 35+4
x=39
Vậy x=39
130 - 3(x - 4) = 25
3(x - 4) = 130 - 25
3(x - 4) = 105
x - 4 = 105 : 3
x - 4 = 35
x = 35 + 4
x = 39
130 - 3 ( x - 4 ) = 25
3 . ( x - 4 ) = 130 - 25
3 . ( x - 4 ) = 105
x - 4 = 105 : 3
x - 4 = 35
x = 35 + 4
x = 39
Tìm x biết [250-25):15]:x=(450-60):130
=> 15 : x = 390 : 130
15 :x = 3
=> x = 5
số quá chẵn
Tìm x. Biết [(250-25):15]:x=(456-60):130
Tìm x, biết :
5x - 130=25
\(5x-130=25\)
\(\Rightarrow5x=25+130\)
\(\Rightarrow5x=155\)
\(\Rightarrow x=155:5\)
\(\Rightarrow x=31\)
5x - 130 = 25
5x = 25 + 130
5x = 155
x = 155 : 5
x = 31
130 - ( 100 + x )=25
Tìm x đi nha mấy ông mấy bà
\(130-\left(100+x\right)=25\)
\(100+x=130-25\)
\(100+x=105\)
\(x=105-100\)
\(x=5\)
Vậy \(x=5\)
130 - ( 100 + x ) = 25
100 + x = 130 - 25
100 + x = 105
x = 105 - 100
x = 5
vậy x = 5
Tìm x, biết :
a) 120 + ( 50 + x ) = 180
b) 130 - ( 100 + x ) = 25
a) 120 + ( 50 + x ) = 180
50 + x = 180 - 120
50 + x = 60
x = 60 - 50
x = 10
b) 130 - ( 100 + x )= 25
100 + x = 130 - 25
100 + x = 105
x = 105 - 100
x = 5
a) 50 + x = 180 - 120
50 + x = 60
x = 60 - 50
x = 10
b)100 + x = 130 - 25
100 + x = 105
x = 105 - 100
x = 5.
a) 120 + ( 50 + x ) = 180
50 + x = 180 - 120
50 + x = 60
x = 60 - 50
x = 10
b) 130 - ( 100 + x )= 25
100 + x = 130 - 25
100 + x = 105
x = 105 - 100
x = 5
tìm cách tính thuận tiện nhất :
725 : 25 + 525 : 25
234 x 45 + 55 + 234 + 234
50 x 8 x 125 x 20
a: =1250:25=50
b: =234(45+55)+234=23400+234=23634
c: =1000x1000=1000000