(3^2+2^3).x+4^2.2.x=98
(9+8).x+16.2.x=98
17.x+16.2.x=98
17.x+32.x=98
(17+32).x=98
49.x=98
x=98:49
x=2
(3^2+2^3).x+4^2.2.x=98
(9+8).x+16.2.x=98
17.x+16.2.x=98
17.x+32.x=98
(17+32).x=98
49.x=98
x=98:49
x=2
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
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) 210 – 5.x = 200;
b) 210 : x – 10 = 20;
c) 210 – 5.( x – 10) =200;
d) (2x + l):7 = 22+32;
e) 450:[41–(2x–5)] = 32.5;
f) (5x – 39).7 + 3 = 80.
Tìm x, biết:
a) 210 - 5.x = 200;
b) 210:x - 10 = 20;
c) 210 - 5.( x -10) =200;
d) ( 2 x + 1 ) : 7 = 2 2 + 3 2 ;
e) 450 : [ 41 - ( 2 x - 5 ) ] = 3 2 . 5 ;
f) (5x - 39).7 + 3 = 80.
Tìm số tự nhiên x , biết:
a, 36:(x–5) = 2 2
b, [3.(70–x)+5]:2 = 46
c, 450:[41–(2x–5)] = 3 2 .5
d, 230+[ 2 4 +(x–5)] = 315. 2018 0
e, 2 x + 2 x + 1 = 48
f, 3 x + 2 + 3 x = 2430
Tìm x:
5x + 2x . ( 23 . 5 - 32 . 4 ) + 52 = 43
4) -23 +x = - (- 25) 5) -5 ≤ x < 6 | 6) 140 : (x – 8) = 7 7) -4(x + 41) = 400 8) 2x – 49 = 5 . 32 |
Bài3:Tìm x:
a) 71 – (33 + x) = 26 b) (x + 73) – 26 = 76 c) 45 – (x + 9) = 6 d) 89 – (73 – x) = 20 e) 4(x + 41) = 400 f) 11(x – 9) = 77 | g) (x + 7) – 25 = 13 h) 198 – (x + 4) = 120 i) 5(x – 9) = 350 j) 2x – 49 = 5.32 k) 25 + 3(x – 8) = 106 l) 32(x + 4) – 52 = 5.22 | m) 200 – (2x + 6) = 43 n) 2(x- 51) = 2.23 + 20 o) 450 : (x – 19) = 50 p) 4(x – 3) = 72 – 110 q) 156 – (x+ 61) = 82 r) (x-35) -120 = 0 |
1. Tìm x, y ∈ N biết
a) 19 - (x + 23) = 24 - 6
b) 43 + 32 : (x + 1) - 65
c) (2x + 1)3 - 52 = 102
d) 15 . 2x - 7 . 2 +x-2 = 212
e) 1 + 3 + 32 + .... + 3x = 314
g) 2x - 2y = 7
2. a) So sánh 2150 và 3100
b) Tìm chữ số tận cùng của A = 22023 + 32024