tim x
17-2.(2x-3)=3
tìm x
17-(3+x)+15-|-3|=2+2x
17-(3+x)+15-|-3|=2+2x
17-3-x+15-3=2+2x
26-x=2+2x
-x-2x=2-26
-3x=-24
x=8
Ta có: \(17-\left(3+x\right)+15-\left|-3\right|=2+2x\)
\(\Leftrightarrow17-3-x+15-3-2-2x=0\)
\(\Leftrightarrow-3x+24=0\)
\(\Leftrightarrow-3x=-24\)
hay x=8
tim X
X x 2/5 + X x17/10=1113/10
Ta có X x 2/5 + X x17/10=1113/10
X x ( 2/5 + 17/10) = 1113/10
X x 21/10 = 1113/10
X = 1113/10 : 21/10
X = 53
Ta có X x 2/5 + X x17/10=1113/10
X x ( 2/5 + 17/10) = 1113/10
X x 21/10 = 1113/10
X = 1113/10 : 21/10
X = 53
tìm x
17/2 : x = 5
x-3/8 =2+1/4
`17/2 \div x=5`
`x=17/2 \div 5`
`x=17/10 = 1,7`
`----`
`x-3/8=2+1/4`
`x-3/8=9/4`
`x=9/4+3/8`
`x=21/8`
`\color{blue}\text {#DuyNam}`
\(\dfrac{17}{2}:x=5\)
\(x=\dfrac{17}{2}:5=\dfrac{17}{2}\times\dfrac{1}{5}\)
\(x=\dfrac{17}{10}\)
_____________________________
\(x-\dfrac{3}{8}=2+\dfrac{1}{4}\) \(=\dfrac{8}{4}+\dfrac{1}{4}\)
\(x-\dfrac{3}{8}=\dfrac{9}{4}\)
\(x=\dfrac{9}{4}+\dfrac{3}{8}=\dfrac{18}{8}+\dfrac{3}{8}\)
\(x=\dfrac{21}{8}\)
`17/2:x=5`
`x=17/2:5`
`x=17/10`
Vậy `x=17/10`
___________________
`x-3/8=2+1/4`
`x-3/8=9/4`
`x=9/4+3/8`
`x=21/8`
Vậy `x=21/8`
`@Nae`
tim x
[ 61+(53-x)]x17=1785
[ 61 + ( 53 - x ) ] x 17 = 1785
61 + 53 - x = 1785 : 17
114 - x = 105
x = 114 - 105
x = 9
\(\left[61+\left(53-x\right)\right].17=1785\)
\(\Leftrightarrow61+\left(53-x\right)=105\)
\(\Leftrightarrow53-x=44\Leftrightarrow x=9\)
(61+(53-x))=1785:17
(61+(53-x))=105
53-x=105-61
53-x=44
x=53-44
x=9
Tìm x ϵ N biết :
a) 280 – ( x – 140 ) : 35 = 270 ;
b)( 190 – 2x ) : 35 – 32 = 16;
c) 720 : [ 41 – ( 2x – 5 ) ] = 23 .5
d) ( x : 23 + 45 ) . 37 – 22 = 24 . 105 ;
e) ( 3x – 4 ) . ( x – 1 ) 3 = 0 ;
f) 22x-1 : 4 = 83
g) x17 = x ;
h) ( x – 5 ) 4 = ( x – 5 ) 6 ;
i) ( x + 2 ) 5 = 210 ;
k ) 1 + 2 + 3 + … + x = 78
l) ( 3 .x – 24) . 73 = 2 .74 ;
n) 5x : 52 = 125 ;
m) ( x + 1) 2 = ( x + 1) 0 ;
o) ( 2 + x ) + ( 4 + x ) + ( 6 + x ) + ……+ ( 52 + x ) = 780 ;
p) 70⋮ x , 80 ⋮ x và x > 8
q) x ⋮ 12 , x ⋮ 25 , x ⋮ 30 và 0 < x < 500
2x 17 + 38 x17 + 31 x 17 + 29 x 17
2 x 17 + 38 x 17 + 31 x 17 + 29 x 17
= 17 x ( 2 + 38 + 31 + 29 )
= 17 x 100
= 1700
2x17+38x17+31x17+29x17
=17x(2+38+31+29)
+17x100
=1700
2 x 17 + 38 x17 + 31 x 17 + 29 x 17
= 17 x ( 2 + 38 + 31 + 29 )
= 17 x 100
= 1700
149-(35:x+3)x17=13
149 - ( 35 : x + 3 ) x 17 = 13
( 35 : x + 3 ) x 17 = 136
35 : x + 3 = 8
35 : x = 5
x = 7
tim x biet : (2x+3)^2x - 2*(2x+3)*(2x-5)+(2x-5)^2=x^2+6x+64
\(\Leftrightarrow\left(2x+3-2x+5\right)^2=x^2+6x+64\)
=>x^2+6x=0
=>x(x+6)=0
=>x=0 hoặc x=-6
a)2x.4=128
b)x17=x
c)(x-6)lũy thừa 3=(x-6)lũy thừa 2
d)(7x-11)lũy thừa 3=2 lũy thừa 5.5 lũy thừa 2+200
2/So sánh
a)3 lũy thừa 2 và 2 lũy thừa 4
b)3 lũy thừa 2+4 luỹ thừa 2 và(3+4)luỹ thừa 2
c)13-9 và (13-9) luỹ thừa 2
d)a luỹ thừa 2+b luỹ thừa 2 và(a+b) luỹ thừa 2
a) 2x . 4 = 128
2x = 128 : 4
2x = 32
x = 32 : 2
x = 16
b)x . 17 = x
=> x = 0
tim x : x^2-2x-3=0 ;2x^2+5x-3=0