bài 1:
a. S2 = 21+23+25+...+1001
b. S4 = 15+25+35+..+115
bài 2:
a. 2x-138= 23 .32
b. 5.(x+35) = 515
c. 814- ( x-305)=712
d. 20 - [ 7(x-3) +4] =2
e. 9x-1 =9
e. 5x-2 -32 = 24 - (28. 22 - 210 . 22)
18- 4x = -20-6x
h)-15 x 24 = - 7x +32
i) 15x- 3(4x - 6) = - 12+ 36
k) -10 x - 27 = - 7x +33
m) -17 x - 24 = - 9x - 40
n) -23 x 25 = - 18x +75
p) - 5x+ 7( 2x-3) = 4( x - 4)
q)24- 6(3x + 1) = -5( 4x- 4 ) - 8
r) 18-4. (6-2x) = -3.(4x +5 ) - 11
Jup mik pls
Tìm số tự nhiên x biết:
a) 25 + 7x = 144
b) 33 - 12x = 9
c) 128 - 3(x + 4) = 23
d) 71 + (726 - 3x).5 = 2246
e) 720 : [41 - (2x + 5)] = 40
f) (10 - 4x) + 120 : 8 = 16 + 1
g) x + 9x + 7x + 5x = 2244
h) (x + 1) + (x + 2) + (x + 3) +...+ (x + 100) = 5750
i) 1 + 2 + 3 +...+ x = 500500
j) 51 + 52 + 53 +...+ x = 18825
a) 2(3x – 4) = 18
b) (105 – x) : 25 = 30 + 1
c) 2x – 138 = 22 . 32
d) (6x – 39) . 28 = 5628
e) (9x + 2) . 3 = 60
g) (26 – 3x) : 5 + 71 = 75
h) 5x+1 = 125
i) (x – 5)(2x + 8) = 0
Mong mọi người giúp mình ạ
18x - 19 = 21+8x
g)18- 4x = -20-6x
h)-15x - 24 = - 7x +32
i) 15x- 3(4x - 6) = - 12+ 36
k) -10 x - 27 = - 7x +33
m) -17 x - 24 = - 9x - 40
n) -23x + 25 = - 18x +75
p) - 5x+ 7( 2x-3) = 4( x - 4)
q)24- 6(3x + 1) = -5( 4x- 4 ) - 8
r) 18-4. (6-2x) = -3.(4x +5 ) - 11
s) - 5. ( 4x-5) - 14 = 6.(2 - 3x) - 10x-9
giúp mik với giải cả cách làm nhé
c) (7x + x – 28) :100 – 38 = 9.
d) 936 – (4x + 5x ) = 900
e) 280 + 78 : (135 – x :7) =286
f) x – 18 :3 = 16 + 16 : 23.
g) (3x – 10) : 10 = 20.
h) (3x – 24 ).73= 2.74
i) 123 – 5.( x + 4) = 38.
k) [(6x – 72) :2 – 84].28 = 5628.
m) 2x – 138 = 23.32.
n) [(10 - x).2 + 7]:3 -2 = 3.
Trình bày kết quả rõ ràng nha cảm ơn mọi người rất nhiều❤❤❤
1) 168 - ( 18 - 2x ) x 12 = 120
2) [ 75 + ( 16 - x ) ] x 2 = 156
3) 124 - 24 x ( 3x - 16 ) = 76
4) [ ( 10 - x ) x 2 + 5 ] : 3 - 2 = 3
5) [ 80 + ( 62 - x ) ] : 17 - 7 = 1
6) 65 - ( 5x - 70 ) : 2 = 50
7) 504 : 9 136 - 2x ) + 4 = 32
8) ( 13x - 28 ) x 15 - 5 x 23 = 320
Mình cần gấp ạ !!!
Giúp mình v
Bài10872917292872917 tìm x bt
5x-16=40+x
4x-10=15-x
-12+x=5x-2
7x-4=20+3x
5x-7=20+3x
x+15=7+6x
17-x=7-6x
3x+(-21)=12-8x
125:(3x-13)=25
541+(218-z)=735
3(2x+1)-19=14
175-5(x+3)=85
4x-40=|4|+12
x+15=20-4x
8x+|-3|=-4x+39
6(x-2)+(-2)=20-4x
A) 78-2x=42
B)6x+39=75
C) 2^3.x+ 2.x=25.2^2
D) 21+7x = 56
E) 5x +2x = 6^2-5^0
F)15x + 3x = 450 : 2+9
G) 6x+x=5^11: 5^9+3^1
H) 5x + 3x=3^11: 3^8.4+12
i) 2^3.x + 2^2.x =136-2^20 : 2^16
j) 7x -x= 5^21: 5^19+3.2^2
k) 7x - 2x= 6^17: 6^15 + 44 :11
l) 0: x =0 m) 3^x=27 n) 4^x= 64
o) 2^x = 32 p) 9^x-1=81 q) x^4=16
r) 3^x :3^
p) 9^x-1=81
q) x^4=165=1