(x + 1) + (x + 3) + (x + 5) + ... + (x + 81) = 0
=> (x + x + x + ... + x) + (1 + 3 + 5 + ... + 81) = 0
Đặt A = 1 + 3 + 5 + ... + 81
Số số hạng của A là: (81 - 1) : 2 + 1 = 41 (số)
=> 41x + (81 + 1).41:2 = 0
=> 41x + 1681 = 0
=> 41x = -1681
=> x = -41
X+2x=234 bang bao nhieu vay may ban
1) (-1005).(x cong 2 ) bang 0
2) x cong x cong x cong 91 bang -2
3) / 5x cong 1/ bang 11
( thong cam nha , may mik k viet dc dau cong vs bang )
mik dg gap , giup mik nhe !
(7-x).(2019.2019.1024.12465.465768.97868.4464.9808087.5456.4.4533)=0
x bang may
x^2=1 vay x bang bao nhieu
x5-9x3=0
(3x+1-81)(x3-1)=0
(x-2).(2x-6)=0
(3x+9).(1-3x)=0
(x2+1).(81-x2) =0
5-|2x-1| = (-6)
|2-x| +2 =x
|x+1|=|x-3|
a) (x-1) x (x+3) = 0
b) (x2 - 1) x (x2 - 81) = 0
c)(x2+ 1) x(x2 - 125) =0
d)(x -5)2=36
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
tim x
a. 8x+2x bang 25.2 2
b. 5x+2x bang 6 2- 5 0
c. 5x+x bang 150 chia 2+3
d.6x+x bang 5 11 chia 5 9+3 1
