(2x+)³-23=41
a) x – 36 : 18 = 12 – 15
b) 92 – (17 + x) = 72
c) 720 : [41 – (2x + 5)] = 40
d) (x + 2)3 - 23 = 41
\(a,x-36:18=12-15\\ \Rightarrow x-2=-3\\ \Rightarrow x=-1\\ b,92-\left(17+x\right)=72\\ \Rightarrow17+x=20\\ \Rightarrow x=3\\ c,720:\left[41-\left(2x+5\right)\right]=40\\ \Rightarrow41-\left(2x+5\right)=18\\ \Rightarrow2x+5=23\\ \Rightarrow2x=18\\ \Rightarrow x=9\\ d,\left(x+2\right)^3-23=41\\ \Rightarrow\left(x+2\right)^3=64\\ \Rightarrow\left(x+2\right)^3=4^3\\ \Rightarrow x+2=4\\ \Rightarrow x=2\)
b: =>x+17=20
hay x=3
d: =>x+2=4
hay x=2
Tìm x
23+3x=125
41-(2x-5)=18
23+3x=125
3x=125-23
3x= 102
x= 102:3
x= 34
41-(2x-5)=18
2x-5=41-18
2x-5=23
2x=23+5
2x=28
x=28:2
x=14
1, 7+x-(5+2x)>31-6
2, 15-x-(41-2x)<16-23
giải hộ mình,nhanh nhé!
2x +35 = x -27
2x - 41 = 3x = (-23)
4(x-3) - 3(x+5) = 45. (-2) -34
(x+3).(2x-18) = 0
(x+3).(2x-18)=0
=>x+3=0 hoặc 2x-18 =0
+)x+3=0
x=-3
+)2x-18=0
2x =18
x =9
Vậy x \(\in\)\(_{\left\{-3;9\right\}}\)
4) -23 +x = - (- 25) 5) -5 ≤ x < 6 | 6) 140 : (x – 8) = 7 7) -4(x + 41) = 400 8) 2x – 49 = 5 . 32 |
6: \(\Leftrightarrow x-8=20\)
hay x=28
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
Tìm x biết:
a, 2 3 x + 5 2 x = 2 5 2 + 2 3 - 33
b, 260 : x + 4 = 5 2 3 + 5 - 3 3 2 + 2 2
c, 720 : [ 41 - 2 x - 5 ] = 2 3 . 5
d, 3 2 - 2 x - 12 + 35 = 5 2 + 279 : 3 2
a, 2 3 x + 5 2 x = 2 5 2 + 2 3 - 33
8x+25x = 33
33x = 33
x = 1
b, 260 : x + 4 = 5 2 3 + 5 - 3 3 2 + 2 2
260:(x+4) = 5.13–3.13
x+4 = 260:26
x+4 = 10
x = 6
c, 720 : [ 41 - 2 x - 5 ] = 2 3 . 5
41–(2x–5) = 720:40
2x–5 = 41–18
2x = 28
x = 14
d, 3 2 - 2 x - 12 + 35 = 5 2 + 279 : 3 2
7(x–12)+35 = 56
7(x–12) = 21
x–12 = 3
x = 15
To chiu roi
2x+35=x-27
2x-41=3x+(-23)
4(x-3)-3(x+5)=45.(-2)-34
(x+3).(2x-18)=0
Thx
\(a.2x+35=x-27\)
\(\Leftrightarrow2x-x=-27-35\)
\(\Rightarrow x=-62\). Vậy \(x=-62\)
\(b.2x-41=3x+\left(-23\right)\)
\(\Leftrightarrow2x-3x=-23+41\)
\(\Leftrightarrow-x=18\)
\(\Rightarrow x=-18\). Vậy \(x=-18\)
\(c.4\left(x-3\right)-3\left(x+5\right)=45.\left(-2\right)-34\)
\(\Leftrightarrow4x-12-3x-15=-124\)
\(\Leftrightarrow4x-3x=-124+12+15\)
\(\Rightarrow x=-97\). Vậy \(x=-97\)
\(d.\left(x+3\right)\left(2x-18\right)=0\)
\(\Leftrightarrow\hept{\begin{cases}x+3=0\\2x-18=0\end{cases}\Rightarrow\hept{\begin{cases}x=-3\\x=9\end{cases}}}\). Vậy \(x=-3;9\)
tìm x
2x+143=557
2x2+12x-23=-41
3x3+9x2+9x+3=0
a)\(2x+143=557\)
\(\Leftrightarrow2x=557-143\)
\(\Leftrightarrow2x=414\)
\(\Leftrightarrow x=414\div2\)
\(\Leftrightarrow x=207\)
Vậy x = 207
\(2x^2+12x-23=-41\)
\(\Rightarrow2x^2-12x+18=0\)
\(\Rightarrow2x^2-4x-9x+18=0\)
\(\Rightarrow2x.\left(x-2\right)-9.\left(x-2\right)=0\)
\(\Rightarrow\left(x-2\right).\left(2x-9\right)=0\)
....
b) \(2x^2+12x-23=-41\)
\(\Leftrightarrow2x\left(x+6x\right)=-41+23\)
\(\Leftrightarrow2x\left(x+6x\right)=-18\)
\(\Leftrightarrow x\left(x+6x\right)=-18\div2\)
\(\Leftrightarrow x^2+6x^2=-9\)(1)
Vì \(\hept{\begin{cases}x^2\ge0\\6x^2\ge0\end{cases}}\Rightarrow x^2+6x^2\ge0\)[Trái với (1)]
Vậy phương trình vô nghiệm