Tìm x
24.X - 32. X = 145-255:51
580:(X-24)=329-150:2
7.(X-4)+35=25+279:9
Bài 1: Tìm x, biết:
a) 24 . x - 32 . x = 145 - 255 / 51
b) 580 / ( x - 24 ) = 329 - 150 . 2
c) 7. ( x - 14 ) + 35 = 25 + 279 / 9
thanks
a) \(2^4.x-3^2.x=145-\frac{255}{51}\Rightarrow x.\left(2^4-3^2\right)=145-5\)
\(\Rightarrow7.x=140\Rightarrow x=20\)
b) \(\frac{580}{x-24}=329-150.2\Rightarrow\frac{580}{x-24}=329-300\Rightarrow\frac{580}{x-24}=29\Rightarrow x-24=20\)
\(\Rightarrow x=44\)
c) \(7.\left(x-14\right)+35=25+\frac{279}{9}\Rightarrow7.\left(x-14\right)=25+31-35\)
\(\Rightarrow7.\left(x-14\right)=21\Rightarrow x-14=3\Rightarrow x=17\)
Tìm x :
a)\(2^4.x-3^2.x=145-255:51\)
b)\(580:\left(x-24\right)=329-150.2^1\)
c)\(7.\left(x-14\right)+35=25+279:9\)
b)580:(x-24)=329-150.2 580:(x-24)=329-300 580:(x-24)=29 (x-24)=580:29 (x-24)=20 x=20+24 x=44
Bài 1: Tìm x
a) 7x + 2x = 918
b) 16 . x - 9 . x = 145 - 225 : 51
c) 3. ( x - 2 ) + 150 = 240
d) 580 : ( x - 24 ) = 329 - 150 . 2
e) 7. ( x - 14 ) + 35 = 25 + 279 : 9
g) [ ( 6 . x -72) : 2 - 8] . 28 = 5628
Tìm x
a, 580 :( x -24 ) =329 -150 : 2
b, 7 (x-1 ) +35= 25 + 279 :9
c,4 ( 2x+ 7 ) -3 (3x -2 ) =24
d,( x-1 ) (x-2) =3(x-1)
e,( x+ 3 ) + ( x+7 ) + ( x + 11 ) + ........+ ( x+ 79 ) =860
a, ĐK: \(x\ne24\)
580 :( x -24 ) =329 -150 : 2
<=> 580 :( x -24 ) = 329 - 75
<=> 580 :( x -24 ) = 254
<=> x - 24 = \(\frac{290}{127}\)
<=> x = \(\frac{3338}{127}\left(TM\right)\)
Vậy \(x=\frac{3338}{127}\)
b, 7 (x-1 ) +35= 25 + 279 :9
<=> 7x - 7 + 35 = 25 + 31
<=> 7x +28 = 56
<=> 7x = 28
<=> x = 4
Vậy x =4
c,4 ( 2x+ 7 ) -3 (3x -2 ) =24
<=> 8x + 28 - 9x + 6 = 24
<=> 34 - x = 24
<=> x = 10
Vậy x = 10
d,( x-1 ) (x-2) =3(x-1)
<=> ( x-1 ) (x-2) - 3(x-1) = 0
<=> (x- 1)(x - 2 - 3) = 0
<=> (x -1)(x - 5) = 0
<=> \(\left[{}\begin{matrix}x-1=0\\x-5=0\end{matrix}\right.\) <=> \(\left[{}\begin{matrix}x=1\\x=5\end{matrix}\right.\)
Vậy x ={1; 5}
e, (x + 3) + (x + 7) + (x + 11) + ... + (x + 79) = 860
x + 3 + x + 7 + x + 11 + ... + x + 79 = 860
Có tất cả: (79 - 3) : 4 + 1 = 20 số hạng \(\Rightarrow\) có 20x
hay x + 3 + x + 7 + x + 11 + ... + x + 79 = 860
\(\Rightarrow\) 20x + (3 + 7 + ... + 79) = 860
3 + 7 + ... + 79 = (79 + 3) x 20 : 2 = 820
\(\Rightarrow\) 20x + (3 + 7 + ... + 79) = 860
\(\Rightarrow\) 20x + 820 = 860
\(\Rightarrow\) 20x = 40
\(\Rightarrow\) x = 2
Vậy x = 2
Chúc bn học tốt!
a) 580:(x-24)=329-150.21
b)7.(7-14)+35=25+279:9
a) 580 : ( x - 24 ) = 329 - 150 . 21
=> 580 : ( x - 24 ) = 329 - 150 . 2
=> 580 : ( x - 24 ) = 329 - 300
=> 580 : ( x - 24 ) = 29
=> x - 24 = 20
=> x = 20 + 24
=> x = 44
Vậy x = 44
mk nha các bạn !!!
=> 580 : ( x - 24 ) = 329 - 150 . 2
=> 580 : ( x - 24 ) = 329 - 300
=> 580 : ( x - 24 ) = 29
=> x - 24 = 20
=> x = 20 + 24
=> x = 44
Vậy x = 44
tim x :
a)24.x -32.x =145-255:51
b)580 : ( x -24)=329-150* 21
c) 4x + 4x+1 + 4x+3=1136
a)24.x -32.x =145-255:51
x . (24 - 32) = 145 - 5
x . (32 - 9) = 140
x . 23 = 140
x = 140 : 23
x = ????
b)580 : ( x -24)=329-150* 21
580 : (x - 24) = 329 - 300
580 : (x - 24) = 29
x - 24 = 580 : 29
x - 24 = 20
x = 20 + 24
x = 44
c) 4x + 4x+1 + 4x+3=1136
4x + 4x .41 + 4x .43 = 1136
4x . ( 1 + 4 + 43) = 1136
4x . 64 = 1136
4x = 1136 : 64
580:(x-24)=329-150:2
24 * x -32 * x = 145-225:51
5x + 1 = 625
580:(x-24)=329-150:2
=> 580:(x-24)=329-75
=> 580:(x-24)=254
=>x-24= 580:254
=> x = 290/127 + 24
=> x = 3338/127
+) 24 * x -32 * x = 145-225:51
=> x.(24 -32) = 145-225:51
=> x.7= 145-225:51
=> x.7= 2390/17
=> x= 2390/119
+) 5x + 1 = 625
=> 5x + 1 = 54
=> x+1 = 4
=> x = 3
24.x-32.x=145-255:51
\(\Leftrightarrow7x=145-5=140\)
hay x=20
Giá trị nào dưới đây của x thỏa mãn 2 4 .x - 3 2 .x = 145 - 255:51
A. x = 20
B. x = 30
C. x = 40
D. x = 80
Đáp án là A
Ta có: 2 4 .x - 3 2 .x = 145 - 255:51
⇔ 16x - 9x = 145 - 5
⇔ 7x = 140
⇔ x = 20